I would hate for them to be toned down, but it is such a shame that a toggle seems impossible.
I would love to buy this pack and have some games where I can play vampires and have dark spookiness etc etc, but I would also like to have some games that do not involve vampires at all.
Maybe they could come up with an option like they did in ts3 latest update, where you can select for certain packs to load when you start the game up? I wouldn't mind going without the furnishings etc for some games to be vampire free, and then when I wanted to play full-on vampishness I could select to play with that pack loaded :p