Initial commit - lays out the foundation for a more robust limb icon override system. You're welcome.

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

@@ -104,7 +104,7 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 	var/fixed_mut_color3 = ""
 	var/whitelisted = 0 		//Is this species restricted to certain players?
 	var/whitelist = list() 		//List the ckeys that can use this species, if it's whitelisted.: list("John Doe", "poopface666", "SeeALiggerPullTheTrigger") Spaces & capitalization can be included or ignored entirely for each key as it checks for both.
-	var/should_draw_citadel = FALSE
+	var/icon_limbs //Overrides the icon used for the limbs of this species. Mainly for downstream, and also because hardcoded icons disgust me. Implemented and maintained as a favor in return for a downstream's implementation of synths.
 
 ///////////
 // PROCS //

code/modules/mob/living/carbon/human/species_types/bugmen.dm

@@ -13,7 +13,7 @@
 	meat = /obj/item/reagent_containers/food/snacks/meat/slab/human/mutant/insect
 	liked_food = MEAT | FRUIT
 	disliked_food = TOXIC
-	should_draw_citadel = TRUE
+	icon_limbs = DEFAULT_BODYPART_ICON_CITADEL
 
 /datum/species/insect/spec_death(gibbed, mob/living/carbon/human/H)
 	if(H)

code/modules/mob/living/carbon/human/species_types/furrypeople.dm

@@ -2,7 +2,7 @@
 	name = "Anthromorph"
 	id = "mammal"
 	default_color = "4B4B4B"
-	should_draw_citadel = TRUE
+	icon_limbs = DEFAULT_BODYPART_ICON_CITADEL
 	species_traits = list(MUTCOLORS,EYECOLOR,LIPS,HAIR,HORNCOLOR,WINGCOLOR)
 	inherent_biotypes = MOB_ORGANIC|MOB_HUMANOID|MOB_BEAST
 	mutant_bodyparts = list("mam_tail", "mam_ears", "mam_body_markings", "mam_snouts", "deco_wings", "taur", "horns", "legs")
@@ -55,7 +55,7 @@
 	id = "xeno"
 	say_mod = "hisses"
 	default_color = "00FF00"
-	should_draw_citadel = TRUE
+	icon_limbs = DEFAULT_BODYPART_ICON_CITADEL
 	species_traits = list(MUTCOLORS,EYECOLOR,LIPS)
 	mutant_bodyparts = list("xenotail", "xenohead", "xenodorsal", "mam_body_markings", "taur", "legs")
 	default_features = list("xenotail"="Xenomorph Tail","xenohead"="Standard","xenodorsal"="Standard", "mam_body_markings" = "Xeno","mcolor" = "0F0","mcolor2" = "0F0","mcolor3" = "0F0","taur" = "None", "legs" = "Digitigrade")

code/modules/mob/living/carbon/human/species_types/ipc.dm

@@ -3,7 +3,7 @@
 	id = "ipc"
 	say_mod = "beeps"
 	default_color = "00FF00"
-	should_draw_citadel = TRUE
+	icon_limbs = DEFAULT_BODYPART_ICON_CITADEL
 	blacklisted = 0
 	sexes = 0
 	species_traits = list(MUTCOLORS,NOEYES,NOTRANSSTING)