I'd been trying to think of more lot trait ideas one of the ones I'd come up with was kind of the extreme or opposite idea to what I mentioned initially depending on how you look at it.
Essentially I'd like a trait that make a space not just werewolf friendly but werewolf exclusive so non-werewolf sims would either be put off going there or wouldn't be able to enter the property at with the explanation being that they are too scared of the place to go. The main reason I want this is due to the negatives you get from turning into a werewolf around non-werewolf sims.