I recently found a pretty good lich costume mesh and decided it would be cool to do sort of a Gray Cowl of Nocturnal thing where it sets all of your stats to those of a lich when you equip it and puts them back when it is unequipped. My question is this: is it possible to "disable" all of an NPC's or the player's abilities such as birthsigns, non permanently, so they return when the costume is removed? It is not really crucial, but I think it would be great if the suit made you completely a lich except for skills, since creatures don't have those.

Also, do Health Mult, Spell Pts Mult, and Fatigue Mult in creature stats work with the same ratio as the player spell points multiplier, and if so, what attribute affects them (or is it level)?