fix

code/modules/mob/living/carbon/human/human_defines.dm

@@ -15,6 +15,7 @@
 
 	block_parry_data = /datum/block_parry_data/unarmed/human
 	default_block_parry_data = /datum/block_parry_data/unarmed/pugilist
+	causes_dirt_buildup_on_floor = TRUE
 
 	//Hair colour and style
 	var/hair_color = "000"

code/modules/mob/living/carbon/human/human_movement.dm

@@ -100,3 +100,8 @@
 	if(dna.species.space_move(src))
 		return TRUE
 	return ..()
+
+/mob/living/carbon/human/dirt_buildup(strength)
+	if(!shoes || !(shoes.body_parts_covered & FEET))
+		return	// barefoot advantage
+	return ..()

code/modules/mob/living/living_defines.dm

@@ -64,7 +64,7 @@
 	var/incorporeal_move = FALSE //FALSE is off, INCORPOREAL_MOVE_BASIC is normal, INCORPOREAL_MOVE_SHADOW is for ninjas
 								 //and INCORPOREAL_MOVE_JAUNT is blocked by holy water/salt
 	/// Do we make floors dirty as we move?
-	var/causes_dirt_buildup_on_floor = TRUE
+	var/causes_dirt_buildup_on_floor = FALSE
 
 	var/list/roundstart_quirks = list()
 

code/modules/mob/living/living_movement.dm

@@ -114,12 +114,14 @@
 	var/area/A = T.loc
 	if(!A.dirt_buildup_allowed)
 		return
+	var/multiplier = CONFIG_GET(number/turf_dirty_multiplier)
+	strength *= multiplier
 	var/obj/effect/decal/cleanable/dirt/D = locate() in T
 	if(D)
 		D.dirty(strength)
 	else
 		T.dirtyness += strength
-		if(T.dirtyness >= isnull(T.dirt_spawn_threshold)? CONFIG_GET(number/turf_dirt_threshold) : 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.