diff --git a/Makefile b/Makefile
index ceeeef5..50efe3b 100644
--- a/Makefile
+++ b/Makefile
@@ -52,6 +52,8 @@ ENABLE_AUDIO_BAR_DEFAULT     ?=0
 ENABLE_EEPROM_4M       ?=1
 ENABLE_CHINESE_FULL 		  = 4
 ENABLE_DOCK 		  = 1
+ENABLE_CUSTOM_SIDEFUNCTIONS   ?= 1
+ENABLE_SIDEFUNCTIONS_SEND     ?= 0
 
 # ---- DEBUGGING ----
 ENABLE_AM_FIX_SHOW_DATA       ?= 0
@@ -302,6 +304,15 @@ ifeq ($(ENABLE_DOCK),1)
     CFLAGS  += -DENABLE_DOCK
 endif
 
+ifeq ($(ENABLE_CHINESE_FULL),4)
+ifeq ($(ENABLE_CUSTOM_SIDEFUNCTIONS),1)
+    CFLAGS  += -DENABLE_CUSTOM_SIDEFUNCTIONS
+endif
+ifeq ($(ENABLE_SIDEFUNCTIONS_SEND),1)
+    CFLAGS  += -DENABLE_SIDEFUNCTIONS_SEND
+endif
+endif
+
 ifeq ($(ENABLE_TIMER),1)
     CFLAGS  += -DENABLE_TIMER
 endif
diff --git a/README.md b/README.md
index 604f250..ca248a7 100644
--- a/README.md
+++ b/README.md
@@ -135,6 +135,8 @@ ENABLE_AGC_SHOW_DATA          := 0       显示ACG参数
 ENABLE_AUDIO_BAR_DEFAULT      ?=0        默认语音条样式
 ENABLE_EEPROM_4M              ?=1        两个2Mb Eeprom堆叠方案
 ENABLE_CHINESE_FULL 		   =4        编译固件版本选项
+ENABLE_CUSTOM_SIDEFUNCTIONS   ?= 1       自定义侧键功能（仅扩容设备支持）
+ENABLE_SIDEFUNCTIONS_SEND     ?= 0       自定义侧键功能（侧键发射功能）
 ```
 
 # 打赏
diff --git a/app/action.c b/app/action.c
index 6b36c08..8701b05 100644
--- a/app/action.c
+++ b/app/action.c
@@ -100,7 +100,10 @@ void (*action_opt_table[])(void) = {
 
         [ACTION_OPT_D_DCD] = &ACTION_D_DCD,
         [ACTION_OPT_WIDTH] = &ACTION_WIDTH,
-
+#ifdef ENABLE_SIDEFUNCTIONS_SEND
+		[ACTION_OPT_SEND_A] = &ACTION_SEND_A,
+		[ACTION_OPT_SEND_B] = &ACTION_SEND_B
+#endif
 };
 
 static_assert(ARRAY_SIZE(action_opt_table) == ACTION_OPT_LEN);
@@ -276,6 +279,24 @@ void ACTION_Handle(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
 
     enum ACTION_OPT_t funcShort = ACTION_OPT_NONE;
     enum ACTION_OPT_t  funcLong  = ACTION_OPT_NONE;
+
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+	switch(Key) {
+		case KEY_SIDE1:
+			funcShort = gEeprom.KEY_1_SHORT_PRESS_ACTION;
+			funcLong  = gEeprom.KEY_1_LONG_PRESS_ACTION;
+			break;
+		case KEY_SIDE2:
+			funcShort = gEeprom.KEY_2_SHORT_PRESS_ACTION;
+			funcLong  = gEeprom.KEY_2_LONG_PRESS_ACTION;
+			break;
+		case KEY_MENU:
+			funcLong  = gEeprom.KEY_M_LONG_PRESS_ACTION;
+			break;
+		default:
+			break;
+	}
+#else
 	switch(Key) {
 		case KEY_SIDE1:
 			funcShort = ACTION_OPT_MONITOR;//gEeprom.KEY_1_SHORT_PRESS_ACTION;
@@ -291,6 +312,7 @@ void ACTION_Handle(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
 		default:
 			break;
 	}
+#endif
 
 	if (!bKeyHeld && bKeyPressed) // button pushed
 	{
@@ -305,6 +327,16 @@ void ACTION_Handle(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
 	if (bKeyHeld || bKeyPressed) // held
 	{
 		funcShort = funcLong;
+		
+#ifdef ENABLE_SIDEFUNCTIONS_SEND
+		if(funcShort == ACTION_OPT_SEND_A || funcShort == ACTION_OPT_SEND_B){
+			gFlagLastVfo = gEeprom.TX_VFO;
+			gEeprom.TX_VFO = funcShort == ACTION_OPT_SEND_A ? 0 : 1;
+			gFlagReconfigureVfos  = true;
+			gFlagStopTX = true;
+			GENERIC_Key_PTT(bKeyPressed);
+		}
+#endif
 
 		if (!bKeyPressed) //ignore release if held
 			return;
@@ -527,3 +559,8 @@ void ACTION_D_DCD(void)
     gTxVfo->DTMF_DECODING_ENABLE = !gTxVfo->DTMF_DECODING_ENABLE;
 			DTMF_clear_RX();
 }
+
+#ifdef ENABLE_SIDEFUNCTIONS_SEND
+void ACTION_SEND_A(void){return;}
+void ACTION_SEND_B(void){return;}
+#endif
\ No newline at end of file
diff --git a/app/action.h b/app/action.h
index 01417b3..07819fb 100644
--- a/app/action.h
+++ b/app/action.h
@@ -43,5 +43,9 @@ void ACTION_WIDTH(void);
 
 void ACTION_Handle(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld);
 
+#ifdef ENABLE_SIDEFUNCTIONS_SEND
+void ACTION_SEND_A(void);
+void ACTION_SEND_B(void);
+#endif
 #endif
 
diff --git a/app/app.c b/app/app.c
index ce4b3bc..a745942 100644
--- a/app/app.c
+++ b/app/app.c
@@ -1594,6 +1594,19 @@ static void ProcessKey(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
 
             GUI_SelectNextDisplay(DISPLAY_MAIN);
         }
+
+#ifdef ENABLE_SIDEFUNCTIONS_SEND
+		if (gFlagStopTX)
+		{
+			gFlagStopTX = false;
+			RADIO_SetupRegisters(true);
+			GUI_SelectNextDisplay(DISPLAY_MAIN);
+			gEeprom.TX_VFO = gFlagLastVfo;
+			gFlagReconfigureVfos = true;
+			gUpdateDisplay = true;
+			return;
+		}
+#endif
     }
     else // key pressed or held
     {
diff --git a/app/menu.c b/app/menu.c
index 1eda5de..5776014 100644
--- a/app/menu.c
+++ b/app/menu.c
@@ -364,14 +364,16 @@ int MENU_GetLimits(uint8_t menu_id, int32_t *pMin, int32_t *pMax) {
             *pMax = 1;
             break;
 
-//		case MENU_F1SHRT:
-//		case MENU_F1LONG:
-//		case MENU_F2SHRT:
-//		case MENU_F2LONG:
-//		case MENU_MLONG:
-//			*pMin = 0;
-//			*pMax = gSubMenu_SIDEFUNCTIONS_size-1;
-//			break;
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+		case MENU_F1SHRT:
+		case MENU_F1LONG:
+		case MENU_F2SHRT:
+		case MENU_F2LONG:
+		case MENU_MLONG:
+			*pMin = 0;
+			*pMax = gSubMenu_SIDEFUNCTIONS_size-1;
+			break;
+#endif
 
         default:
             return -1;
@@ -802,21 +804,23 @@ void MENU_AcceptSetting(void) {
             gEeprom.BATTERY_TYPE = gSubMenuSelection;
             break;
 
-//		case MENU_F1SHRT:
-//		case MENU_F1LONG:
-//		case MENU_F2SHRT:
-//		case MENU_F2LONG:
-//		case MENU_MLONG:
-//			{
-//				uint8_t * fun[]= {
-//					&gEeprom.KEY_1_SHORT_PRESS_ACTION,
-//					&gEeprom.KEY_1_LONG_PRESS_ACTION,
-//					&gEeprom.KEY_2_SHORT_PRESS_ACTION,
-//					&gEeprom.KEY_2_LONG_PRESS_ACTION,
-//					&gEeprom.KEY_M_LONG_PRESS_ACTION};
-//				*fun[UI_MENU_GetCurrentMenuId()-MENU_F1SHRT] = gSubMenu_SIDEFUNCTIONS[gSubMenuSelection].id;
-//			}
-//			break;
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+        case MENU_F1SHRT:
+        case MENU_F1LONG:
+        case MENU_F2SHRT:
+        case MENU_F2LONG:
+        case MENU_MLONG:
+            {
+                uint8_t * fun[]= {
+                    &gEeprom.KEY_1_SHORT_PRESS_ACTION,
+                    &gEeprom.KEY_1_LONG_PRESS_ACTION,
+                    &gEeprom.KEY_2_SHORT_PRESS_ACTION,
+                    &gEeprom.KEY_2_LONG_PRESS_ACTION,
+                    &gEeprom.KEY_M_LONG_PRESS_ACTION};
+                *fun[UI_MENU_GetCurrentMenuId()-MENU_F1SHRT] = gSubMenu_SIDEFUNCTIONS[gSubMenuSelection].id;
+            }
+            break;
+#endif
 
     }
 
@@ -1156,29 +1160,31 @@ void MENU_ShowCurrentSetting(void) {
             gSubMenuSelection = gEeprom.BATTERY_TYPE;
             break;
 
-//		case MENU_F1SHRT:
-//		case MENU_F1LONG:
-//		case MENU_F2SHRT:
-//		case MENU_F2LONG:
-//		case MENU_MLONG:
-//		{
-//			uint8_t * fun[]= {
-//				&gEeprom.KEY_1_SHORT_PRESS_ACTION,
-//				&gEeprom.KEY_1_LONG_PRESS_ACTION,
-//				&gEeprom.KEY_2_SHORT_PRESS_ACTION,
-//				&gEeprom.KEY_2_LONG_PRESS_ACTION,
-//				&gEeprom.KEY_M_LONG_PRESS_ACTION};
-//			uint8_t id = *fun[UI_MENU_GetCurrentMenuId()-MENU_F1SHRT];
-//
-//			for(int i = 0; i < gSubMenu_SIDEFUNCTIONS_size; i++) {
-//				if(gSubMenu_SIDEFUNCTIONS[i].id==id) {
-//					gSubMenuSelection = i;
-//					break;
-//				}
-//
-//			}
-//			break;
-//		}
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+		case MENU_F1SHRT:
+		case MENU_F1LONG:
+		case MENU_F2SHRT:
+		case MENU_F2LONG:
+		case MENU_MLONG:
+		{
+			uint8_t * fun[]= {
+				&gEeprom.KEY_1_SHORT_PRESS_ACTION,
+				&gEeprom.KEY_1_LONG_PRESS_ACTION,
+				&gEeprom.KEY_2_SHORT_PRESS_ACTION,
+				&gEeprom.KEY_2_LONG_PRESS_ACTION,
+				&gEeprom.KEY_M_LONG_PRESS_ACTION};
+			uint8_t id = *fun[UI_MENU_GetCurrentMenuId()-MENU_F1SHRT];
+
+			for(int i = 0; i < gSubMenu_SIDEFUNCTIONS_size; i++) {
+				if(gSubMenu_SIDEFUNCTIONS[i].id==id) {
+					gSubMenuSelection = i;
+					break;
+				}
+
+			}
+			break;
+		}
+#endif
 
         default:
             return;
diff --git a/chinese.h b/chinese.h
index 1edacbb..1aa2b5c 100644
--- a/chinese.h
+++ b/chinese.h
@@ -277,5 +277,28 @@
 #define 图片 "\x86\x4C\x80\x92"
 #define 信息 "\x89\x89\x8C\x8C"
 
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+#define 侧键一短按 "\x86\x80\x94\x8E\x80\x01\x92\x23\x88\x24"
+#define 侧键一长按 "\x86\x80\x94\x8E\x80\x01\x80\x8E\x88\x24"
+#define 侧键二短按 "\x86\x80\x94\x8E\x80\x03\x92\x23\x88\x24"
+#define 侧键二长按 "\x86\x80\x94\x8E\x80\x03\x80\x8E\x88\x24"
+#define M键长按 "\x4D\x94\x8E\x80\x8E\x88\x24"
+#define 手电筒 "\x80\x86\x81\x1C\x92\x44"
+#define 设置发射功率 "\x82\xCB\x94\x6D\x81\x9A\x8C\x89\x80\xEA\x8F\xEC"
+#define 监听 "\x8B\xCE\x83\xD3"
+#define 声控发射 "\x83\x45\x8E\x29\x81\x9A\x8C\x89"
+#define FM收音机 "\x46\x4D\x82\xDD\x8A\x01\x81\xD9"
+#define 锁定按键 "\x92\x0C\x87\x56\x88\x24\x94\x8E"
+#define 切换信道 "\x80\x7A\x8B\x2F\x89\x89\x92\xC8"
+#define 频率信道模式 "\x94\x10\x8F\xEC\x2F\x89\x89\x92\xC8\x95\xE1\x81\xAA"
+#define 切换调制模式 "\x80\x7A\x8B\x2F\x8D\xA0\x86\x58\x95\xE1\x81\xAA"
+#define DTMF解码 "\x44\x54\x4D\x46\x94\xEA\x85\xCF"
+#define 切换宽窄带 "\x80\x7A\x8B\x2F\x8D\x75\x8D\x7D\x88\x3B"
+#ifdef ENABLE_SIDEFUNCTIONS_SEND
+#define 主频率发射 "\x81\x64\x94\x10\x8F\xEC\x81\x9A\x8C\x89"
+#define 次频率发射 "\x82\x96\x94\x10\x8F\xEC\x81\x9A\x8C\x89"
+#endif
+#endif
+
 #endif
 #endif //UV_K5_FIRMWARE_CUSTOM_0_17_CHINESE_H
diff --git a/misc.c b/misc.c
index 5153683..e694155 100644
--- a/misc.c
+++ b/misc.c
@@ -179,6 +179,10 @@ bool              gFlagPrepareTX;
 bool              gFlagAcceptSetting;
 bool              gFlagRefreshSetting;
 
+#ifdef ENABLE_SIDEFUNCTIONS_SEND
+bool              gFlagStopTX;
+bool              gFlagLastVfo;
+#endif
 bool              gFlagSaveVfo;
 bool              gFlagSaveSettings;
 bool              gFlagSaveChannel;
diff --git a/misc.h b/misc.h
index 0f100de..d40f323 100644
--- a/misc.h
+++ b/misc.h
@@ -259,6 +259,10 @@ extern bool                  gFlagPrepareTX;
 extern bool                  gFlagAcceptSetting;   // accept menu setting
 extern bool                  gFlagRefreshSetting;  // refresh menu display
 
+#ifdef ENABLE_SIDEFUNCTIONS_SEND
+extern bool                  gFlagStopTX;
+extern bool                  gFlagLastVfo;
+#endif
 extern bool                  gFlagSaveVfo;
 extern bool                  gFlagSaveSettings;
 extern bool                  gFlagSaveChannel;
diff --git a/settings.c b/settings.c
index 563a1f9..1ed80ce 100644
--- a/settings.c
+++ b/settings.c
@@ -123,6 +123,17 @@ void SETTINGS_InitEEPROM(void)
 #if ENABLE_CHINESE_FULL==4
     gEeprom.POWER_ON_DISPLAY_MODE        = (Data[7] < 4)              ? Data[7] : POWER_ON_DISPLAY_MODE_NONE;
 #endif
+
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+    // 1FF8..1FFF
+    EEPROM_ReadBuffer(0x1FF8, Data, 8);
+    gEeprom.KEY_M_LONG_PRESS_ACTION       = (Data[0] < ACTION_OPT_LEN) ? Data[0] : ACTION_OPT_SWITCH_DEMODUL;
+    gEeprom.KEY_1_SHORT_PRESS_ACTION      = (Data[1] < ACTION_OPT_LEN) ? Data[1] : ACTION_OPT_MONITOR;
+    gEeprom.KEY_1_LONG_PRESS_ACTION       = (Data[2] < ACTION_OPT_LEN) ? Data[2] : ACTION_OPT_D_DCD;
+    gEeprom.KEY_2_SHORT_PRESS_ACTION      = (Data[3] < ACTION_OPT_LEN) ? Data[3] : ACTION_OPT_WIDTH;
+    gEeprom.KEY_2_LONG_PRESS_ACTION       = (Data[4] < ACTION_OPT_LEN) ? Data[4] : ACTION_OPT_FLASHLIGHT;
+#endif
+
     // 0E98..0E9F
     EEPROM_ReadBuffer(0x0E98, Data, 8);
     memcpy(&gEeprom.POWER_ON_PASSWORD, Data, 4);
@@ -543,6 +554,18 @@ void SETTINGS_SaveSettings(void)
 #endif
     EEPROM_WriteBuffer(0x0E90, State,8);
 
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+    State[0] = gEeprom.KEY_M_LONG_PRESS_ACTION;
+    State[1] = gEeprom.KEY_1_SHORT_PRESS_ACTION;
+    State[2] = gEeprom.KEY_1_LONG_PRESS_ACTION;
+    State[3] = gEeprom.KEY_2_SHORT_PRESS_ACTION;
+    State[4] = gEeprom.KEY_2_LONG_PRESS_ACTION;
+    State[5] = 0;
+    State[6] = 0;
+    State[7] = 0;
+    EEPROM_WriteBuffer(0x1FF8, State, 8);
+#endif
+
     memset(Password, 0xFF, sizeof(Password));
 #ifdef ENABLE_PWRON_PASSWORD
     Password[0] = gEeprom.POWER_ON_PASSWORD;
diff --git a/settings.h b/settings.h
index 4bdacbf..c5b3908 100644
--- a/settings.h
+++ b/settings.h
@@ -94,8 +94,13 @@ enum ACTION_OPT_t {
     ACTION_OPT_BLMIN_TMP_OFF, //BackLight Minimum Temporay OFF
     ACTION_OPT_D_DCD,
     ACTION_OPT_WIDTH,
+#ifdef ENABLE_SIDEFUNCTIONS_SEND
+    ACTION_OPT_SEND_A,
+    ACTION_OPT_SEND_B,
+#endif
     ACTION_OPT_LEN
 };
+
 #ifdef ENABLE_VOICE
 enum VOICE_Prompt_t
 	{
@@ -196,10 +201,12 @@ typedef struct {
 #endif
     ROGER_Mode_t          ROGER;
     uint8_t               REPEATER_TAIL_TONE_ELIMINATION;
-//    uint8_t               KEY_1_SHORT_PRESS_ACTION;
-//    uint8_t               KEY_1_LONG_PRESS_ACTION;
-//    uint8_t               KEY_2_SHORT_PRESS_ACTION;
-//    uint8_t               KEY_2_LONG_PRESS_ACTION;
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+    uint8_t               KEY_1_SHORT_PRESS_ACTION;
+    uint8_t               KEY_1_LONG_PRESS_ACTION;
+    uint8_t               KEY_2_SHORT_PRESS_ACTION;
+    uint8_t               KEY_2_LONG_PRESS_ACTION;
+#endif
     uint8_t               MIC_SENSITIVITY;
     uint8_t               MIC_SENSITIVITY_TUNING;
     uint8_t               CHAN_1_CALL;
@@ -249,7 +256,9 @@ typedef struct {
     uint8_t               field78_0x96;
     uint8_t               field79_0x97;
 
-//    uint8_t 			  KEY_M_LONG_PRESS_ACTION;
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+    uint8_t 			  KEY_M_LONG_PRESS_ACTION;
+#endif
 //    uint8_t               BACKLIGHT_MIN;
 #ifdef ENABLE_BLMIN_TMP_OFF
     BLMIN_STAT_t		  BACKLIGHT_MIN_STAT;
diff --git a/ui/menu.c b/ui/menu.c
index a7d91fa..a346708 100644
--- a/ui/menu.c
+++ b/ui/menu.c
@@ -85,6 +85,14 @@ const t_menu_item MenuList[] =
                 {/*"RP STE",*/ VOICE_ID_INVALID, MENU_RP_STE, 过中继尾音消除},
                 {/*"1 Call",*/ VOICE_ID_INVALID, MENU_1_CALL, 按键即呼},
 
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+                {/*"F1Shrt",*/ VOICE_ID_INVALID,                       MENU_F1SHRT        ,侧键一短按},
+                {/*"F1Long",*/ VOICE_ID_INVALID,                       MENU_F1LONG        ,侧键一长按},
+                {/*"F2Shrt",*/ VOICE_ID_INVALID,                       MENU_F2SHRT        ,侧键二短按},
+                {/*"F2Long",*/ VOICE_ID_INVALID,                       MENU_F2LONG        ,侧键二长按},
+                {/*"M Long",*/ VOICE_ID_INVALID,                       MENU_MLONG         ,M键长按},
+#endif
+
 #ifdef ENABLE_DTMF_CALLING
                 {/*"ANI ID",*/ VOICE_ID_ANI_CODE,                      MENU_ANI_ID        ,DTMF_ID},
 #endif
@@ -420,6 +428,43 @@ const char gSubMenu_SCRAMBLER[][7] =
                 "3500Hz"
         };
 
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+const t_sidefunction SIDEFUNCTIONS[] =
+        {
+               {关闭, ACTION_OPT_NONE},
+               {手电筒, ACTION_OPT_FLASHLIGHT},
+               {设置发射功率, ACTION_OPT_POWER},
+               {监听, ACTION_OPT_MONITOR},
+               {扫描, ACTION_OPT_SCAN},
+#ifdef ENABLE_VOX
+               {声控发射,				ACTION_OPT_VOX},
+#endif
+#ifdef ENABLE_ALARM
+                {"ALARM",			ACTION_OPT_ALARM},
+#endif
+#ifdef ENABLE_FMRADIO
+               {FM收音机,		ACTION_OPT_FM},
+#endif
+#ifdef ENABLE_TX1750
+                {"1750HZ",			ACTION_OPT_1750},
+#endif
+               {锁定按键, ACTION_OPT_KEYLOCK},
+               {切换信道, ACTION_OPT_A_B},
+               {频率信道模式, ACTION_OPT_VFO_MR},
+               {切换调制模式, ACTION_OPT_SWITCH_DEMODUL},
+               {DTMF解码, ACTION_OPT_D_DCD},
+               {切换宽窄带, ACTION_OPT_WIDTH},
+#ifdef ENABLE_SIDEFUNCTIONS_SEND
+               {主频率发射, ACTION_OPT_SEND_A},
+               {次频率发射, ACTION_OPT_SEND_B},
+#endif
+#ifdef ENABLE_BLMIN_TMP_OFF
+                {"BLMIN\nTMP OFF",  ACTION_OPT_BLMIN_TMP_OFF}, 		//BackLight Minimum Temporay OFF
+#endif
+        };
+const t_sidefunction *gSubMenu_SIDEFUNCTIONS = SIDEFUNCTIONS;
+const uint8_t gSubMenu_SIDEFUNCTIONS_size = ARRAY_SIZE(SIDEFUNCTIONS);
+#endif
 
 bool gIsInSubMenu;
 uint8_t gMenuCursor;
@@ -1008,13 +1053,15 @@ void UI_DisplayMenu(void) {
 
             break;
 
-//        case MENU_F1SHRT:
-//        case MENU_F1LONG:
-//        case MENU_F2SHRT:
-//        case MENU_F2LONG:
-//        case MENU_MLONG:
-//            strcpy(String, gSubMenu_SIDEFUNCTIONS[gSubMenuSelection].name);
-//            break;
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+        case MENU_F1SHRT:
+        case MENU_F1LONG:
+        case MENU_F2SHRT:
+        case MENU_F2LONG:
+        case MENU_MLONG:
+            strcpy(String, gSubMenu_SIDEFUNCTIONS[gSubMenuSelection].name);
+            break;
+#endif
 
     }
 
diff --git a/ui/menu.h b/ui/menu.h
index 880d39f..cbabb51 100644
--- a/ui/menu.h
+++ b/ui/menu.h
@@ -135,11 +135,13 @@ MENU_PONMSG,
     MENU_F_CALI,  // reference xtal calibration
 #endif
     MENU_BATCAL,  // battery voltage calibration
-//    MENU_F1SHRT,
-//    MENU_F1LONG,
-//    MENU_F2SHRT,
-//    MENU_F2LONG,
-    //MENU_MLONG,
+#ifdef ENABLE_CUSTOM_SIDEFUNCTIONS
+   MENU_F1SHRT,
+   MENU_F1LONG,
+   MENU_F2SHRT,
+   MENU_F2LONG,
+    MENU_MLONG,
+#endif
     MENU_BATTYP
 };