fix

code/controllers/configuration/entries/game_options.dm

@@ -566,3 +566,16 @@
 	config_entry_value = 0.333
 	min_val = 0
 	integer = FALSE
+
+/// Amount of dirtyness tiles need to spawn dirt.
+/datum/config_entry/number/turf_dirt_threshold
+	config_entry_value = 100
+	min_value = 1
+	integer = TRUE
+
+/// Alpha dirt starts at
+/datum/config_entry/number/dirt_alpha_starting
+	config_entry_value = 127
+	max_val = 255
+	min_val = 0
+	integer = TRUE

code/game/objects/effects/decals/cleanable/misc.dm

@@ -65,7 +65,11 @@
 	mergeable_decal = TRUE
 	persistent = TRUE
 
-/obj/effect/decal/cleanable/dirt/proc/dirty(strength)
+/obj/effect/decal/cleanable/dirt/Initialize(mapload)
+	. = ..()
+	alpha = CONFIG_GET(number/dirt_alpha_starting)
+
+/obj/effect/decal/cleanable/dirt/proc/dirty(strength = 1)
 	if(alpha < 255)
 		alpha += strength
 		if(alpha > 255)

code/game/turfs/open.dm

@@ -4,8 +4,8 @@
 	var/dirt_buildup_allowed = FALSE
 	/// Dirt level.
 	var/dirtyness = 0
-	/// Dirt level to spawn dirt.
-	var/dirt_spawn_threshold = 100
+	/// Dirt level to spawn dirt. Null to use config.
+	var/dirt_spawn_threshold
 	/// Slowdown applied to mobs on us.
 	var/slowdown = 0 //negative for faster, positive for slower
 

code/modules/mob/living/living_movement.dm

@@ -107,7 +107,7 @@
 /**
  * Attempts to make the floor dirty.
  */
-/mob/living/proc/dirt_buildup(strength)
+/mob/living/proc/dirt_buildup(strength =)
 	var/turf/open/T = loc
 	if(!istype(T) || !T.dirt_buildup_allowed)
 		return
@@ -119,7 +119,7 @@
 		D.dirty(strength)
 	else
 		T.dirtyness += strength
-		if(T.dirtyness >= T.dirt_spawn_threshold)
+		if(T.dirtyness >= isnull(T.dirt_spawn_threshold)? CONFIG_GET(number/turf_dirt_threshold) : T.dirt_spawn_threshold)
 			D = new /obj/effect/decal/cleanable/dirt(T)
 			D.dirty(T.dirt_spawn_threshold - T.dirtyness)
 			T.dirtyness = 0		// reset.

config/game_options.txt

@@ -668,4 +668,10 @@ ALLOW_CUSTOM_SKINTONES
 
 ## Enables the FoV component, which hides objects and mobs behind the parent from their sight, unless they turn around, duh.
 ## Camera mobs, AIs, ghosts and some other are of course exempt from this. This also doesn't influence simplemob AI, for the best.
-#USE_FIELD_OF_VISION
+#USE_FIELD_OF_VISION
+
+## Default turf threshold to get dirt
+TURF_DIRT_THRESHOLD 100
+
+## Default alpha of dirt on spawn
+DIRT_ALPHA_STARTING 127