Unmodularize keybindings.

code/modules/keybindings/bindings_carbon.dm

@@ -15,4 +15,7 @@
 		if("4")
 			a_intent_change("harm")
 			return
+		if("C")
+			toggle_combat_mode()
+			return
 	return ..()

code/modules/keybindings/bindings_human.dm

@@ -1,4 +1,7 @@
 /mob/living/carbon/human/key_down(_key, client/user)
+	if("Shift")
+		sprint_hotkey(TRUE)
+		return
 	if(client.keys_held["Shift"])
 		switch(_key)
 			if("E") // Put held thing in belt or take out most recent thing from belt
@@ -56,4 +59,11 @@
 					return
 				stored.attack_hand(src) // take out thing from backpack
 				return
-	return ..()
+	return ..()
+
+/mob/living/carbon/human/key_up(_key, client/user)
+	switch(_key)
+		if("Shift")
+			sprint_hotkey(FALSE)
+			return
+	return ..()

code/modules/keybindings/bindings_robot.dm

@@ -9,4 +9,14 @@
 		if("Q")
 			uneq_active()
 			return
-	return ..()
+		if("Shift")
+			sprint_hotkey(TRUE)
+			return
+	return ..()
+
+/mob/living/silicon/robot/key_up(_key, client/user)
+	switch(_key)
+		if("Shift")
+			sprint_hotkey(FALSE)
+			return
+	return ..()