Implemented IS_SLOW.

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

@@ -1,6 +1,9 @@
 /mob/living/carbon/human/movement_delay()
 	var/tally = 0
 
+	if(species && species & IS_SLOW)
+		tally = 10
+
 	if (istype(loc, /turf/space)) return -1 // It's hard to be slowed down in space by... anything
 
 	handle_embedded_objects() //Moving with objects stuck in you can cause bad times.

code/setup.dm

@@ -760,7 +760,6 @@ var/list/RESTRICTED_CAMERA_NETWORKS = list( //Those networks can only be accesse
 #define FEET_PADDED		2
 #define FEET_NOSLIP		4
 
-
 //Language flags.
 #define WHITELISTED 1  // Language is available if the speaker is whitelisted.
 #define RESTRICTED 2   // Language can only be accquired by spawning or an admin.