Adding stuff just for the sake of adding stuff is never a good thing. This doesn't really add to the game at all, if you want to keep a girl enough to raise her from the dead, how did she die in the first place. This seems to fall in the category of adding just so some people can have their personal fetish in, but if they want zombie girls that badly, they can just make a zombie trait and then make zombie girls/zombie template. Definitely something to put in a pack, but not the game proper. Keep things simple in the core game, its easy enough for people to add stuff they like in.