doubled zas debug sensitivity, some tweaks to mouse/ghost spawning

Signed-off-by: Cael_Aislinn <cael_aislinn@yahoo.com.au>

code/modules/mob/dead/observer/observer.dm

@@ -164,7 +164,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 	//locate an empty mouse
 	var/list/eligible_targets = new()
 	for(var/mob/living/simple_animal/mouse/M in world)
-		if(!M.ckey)
+		if(!M.ckey && !M.stat)
 			eligible_targets.Add(M)
 
 	var/mob/living/simple_animal/mouse/target_mouse

code/modules/mob/simple_animal/simple_animal_misc.dm

@@ -198,6 +198,7 @@
 	icon_state = icon_dead
 	stat = DEAD
 	density = 0
+	src << "\red You have died!"
 	return
 
 /mob/living/simple_animal/ex_act(severity)