Allow door buttons to not synchronize opening/closing (#40809)

code/game/machinery/buttons.dm

@@ -181,6 +181,7 @@
 	desc = "A door remote control switch."
 	var/normaldoorcontrol = FALSE
 	var/specialfunctions = OPEN // Bitflag, see assembly file
+	var/sync_doors = TRUE
 
 /obj/machinery/button/door/indestructible
 	resistance_flags = INDESTRUCTIBLE | LAVA_PROOF | FIRE_PROOF | UNACIDABLE | ACID_PROOF
@@ -189,10 +190,12 @@
 	if(!device)
 		if(normaldoorcontrol)
 			var/obj/item/assembly/control/airlock/A = new(src)
-			device = A
 			A.specialfunctions = specialfunctions
+			device = A
 		else
-			device = new /obj/item/assembly/control(src)
+			var/obj/item/assembly/control/C = new(src)
+			C.sync_doors = sync_doors
+			device = C
 	..()
 
 /obj/machinery/button/door/incinerator_vent_toxmix

code/modules/assembly/doorcontrol.dm

@@ -6,6 +6,7 @@
 	var/id = null
 	var/can_change_id = 0
 	var/cooldown = FALSE //Door cooldowns
+	var/sync_doors = TRUE
 
 /obj/item/assembly/control/examine(mob/user)
 	..()
@@ -17,7 +18,7 @@
 	var/openclose
 	for(var/obj/machinery/door/poddoor/M in GLOB.machines)
 		if(M.id == src.id)
-			if(openclose == null)
+			if(openclose == null || !sync_doors)
 				openclose = M.density
 			INVOKE_ASYNC(M, openclose ? /obj/machinery/door/poddoor.proc/open : /obj/machinery/door/poddoor.proc/close)
 	addtimer(VARSET_CALLBACK(src, cooldown, FALSE), 10)