diff --git a/asm/macros/map.inc b/asm/macros/map.inc
index 2040553355..9fd21223ff 100644
--- a/asm/macros/map.inc
+++ b/asm/macros/map.inc
@@ -160,6 +160,6 @@
 	.endm
 
 	@ Defines the flags for a map header. Mirrors the layout of the bitfield in struct MapHeader in include/global.fieldmap.h
-	.macro map_header_flags allow_cycling:req, allow_escaping:req, allow_running:req, show_map_name:req
-	.byte ((\show_map_name & 1) << 3) | ((\allow_running & 1) << 2) | ((\allow_escaping & 1) << 1) | \allow_cycling
+	.macro map_header_flags allow_cycling:req, allow_escaping:req, allow_running:req, show_map_name:req, write_specialvar_iseffect:req
+	.byte ((\write_specialvar_iseffect & 1) << 4) | ((\show_map_name & 1) << 3) | ((\allow_running & 1) << 2) | ((\allow_escaping & 1) << 1) | \allow_cycling
 	.endm
diff --git a/data/maps/BattleFrontier_BattleDomeBattleRoom/map.json b/data/maps/BattleFrontier_BattleDomeBattleRoom/map.json
index b4407e55d6..2cbb02a243 100644
--- a/data/maps/BattleFrontier_BattleDomeBattleRoom/map.json
+++ b/data/maps/BattleFrontier_BattleDomeBattleRoom/map.json
@@ -11,6 +11,7 @@
   "allow_escaping": false,
   "allow_running": false,
   "show_map_name": false,
+  "write_specialvar_iseffect": true,
   "battle_scene": "MAP_BATTLE_SCENE_NORMAL",
   "connections": null,
   "object_events": [
diff --git a/data/maps/BattleFrontier_BattleDomeCorridor/map.json b/data/maps/BattleFrontier_BattleDomeCorridor/map.json
index bb2088e7fc..f55a3e44bc 100644
--- a/data/maps/BattleFrontier_BattleDomeCorridor/map.json
+++ b/data/maps/BattleFrontier_BattleDomeCorridor/map.json
@@ -11,6 +11,7 @@
   "allow_escaping": false,
   "allow_running": false,
   "show_map_name": false,
+  "write_specialvar_iseffect": true,
   "battle_scene": "MAP_BATTLE_SCENE_NORMAL",
   "connections": null,
   "object_events": [
diff --git a/data/maps/BattleFrontier_BattleDomePreBattleRoom/map.json b/data/maps/BattleFrontier_BattleDomePreBattleRoom/map.json
index 5c5b891797..c8e439b126 100644
--- a/data/maps/BattleFrontier_BattleDomePreBattleRoom/map.json
+++ b/data/maps/BattleFrontier_BattleDomePreBattleRoom/map.json
@@ -11,6 +11,7 @@
   "allow_escaping": false,
   "allow_running": false,
   "show_map_name": false,
+  "write_specialvar_iseffect": true,
   "battle_scene": "MAP_BATTLE_SCENE_NORMAL",
   "connections": null,
   "object_events": [
diff --git a/data/maps/BattleFrontier_BattleDomePreBattleRoom/scripts.inc b/data/maps/BattleFrontier_BattleDomePreBattleRoom/scripts.inc
index 3406d4121c..e06284c2ca 100644
--- a/data/maps/BattleFrontier_BattleDomePreBattleRoom/scripts.inc
+++ b/data/maps/BattleFrontier_BattleDomePreBattleRoom/scripts.inc
@@ -18,7 +18,6 @@ BattleFrontier_BattleDomePreBattleRoom_OnFrame:
 
 BattleFrontier_BattleDomePreBattleRoom_EventScript_EnterRoom::
 	goto_if_eq VAR_0x8006, 1, BattleFrontier_BattleDomePreBattleRoom_EventScript_ReturnFromBattle
-	delay 1
 	frontier_set FRONTIER_DATA_RECORD_DISABLED, TRUE
 	setvar VAR_TEMP_0, 1
 	applymovement LOCALID_PLAYER, BattleFrontier_BattleDomePreBattleRoom_Movement_PlayerEnter
diff --git a/include/global.fieldmap.h b/include/global.fieldmap.h
index 6ed5f37fc6..b62901e5ff 100644
--- a/include/global.fieldmap.h
+++ b/include/global.fieldmap.h
@@ -240,8 +240,9 @@ struct MapHeader
     /* 0x1A */ bool8 allowCycling:1;
                bool8 allowEscaping:1; // Escape Rope and Dig
                bool8 allowRunning:1;
-               bool8 showMapName:5; // the last 4 bits are unused
-                                    // but the 5 bit sized bitfield is required to match
+               bool8 showMapName:1;
+               bool8 writeSpecialVarIsEffect:4; // the last 3 bits are unused
+                                    // but the 4 bit sized bitfield is required to match
     /* 0x1B */ u8 battleType;
 };
 
diff --git a/src/script.c b/src/script.c
index 97b7f7bc7f..59306ec999 100644
--- a/src/script.c
+++ b/src/script.c
@@ -648,7 +648,9 @@ void Script_RequestWriteVar_Internal(u32 varId)
 {
     if (varId == 0)
         return;
-    if (SPECIAL_VARS_START <= varId && varId <= SPECIAL_VARS_END)
+
+    if ((!gMapHeader.writeSpecialVarIsEffect)
+     && (SPECIAL_VARS_START <= varId && varId <= SPECIAL_VARS_END))
         return;
     Script_RequestEffects(SCREFF_V1 | SCREFF_SAVE);
 }
diff --git a/tools/mapjson/mapjson.cpp b/tools/mapjson/mapjson.cpp
index 57e7c1337d..d884dac616 100644
--- a/tools/mapjson/mapjson.cpp
+++ b/tools/mapjson/mapjson.cpp
@@ -175,11 +175,17 @@ string generate_map_header_text(Json map_data, Json layouts_data) {
     if (version == "ruby")
         text << "\t.byte " << json_to_string(map_data, "show_map_name") << "\n";
     else if (version == "emerald" || version == "firered")
+    {
         text << "\tmap_header_flags "
              << "allow_cycling=" << json_to_string(map_data, "allow_cycling") << ", "
              << "allow_escaping=" << json_to_string(map_data, "allow_escaping") << ", "
              << "allow_running=" << json_to_string(map_data, "allow_running") << ", "
-             << "show_map_name=" << json_to_string(map_data, "show_map_name") << "\n";
+             << "show_map_name=" << json_to_string(map_data, "show_map_name") << ", ";
+        if (map_data.object_items().find("write_specialvar_iseffect") != map_data.object_items().end())
+            text << "write_specialvar_iseffect=" << json_to_string(map_data, "write_specialvar_iseffect") << "\n";
+        else
+            text  << "write_specialvar_iseffect=FALSE" << "\n";
+    }
 
     if (version == "firered")
         text << "\t.byte " << json_to_string(map_data, "floor_number") << "\n";