Common sense should lead to checking the settings. Just like vampires and dragons, werewolves have already been discussed and they do not, and will not exist in PS. Therefore, it's better if you set your RP with specifications that would make it clear that you're not going against the settings. I think it's ok to RP with lycans but try creatures that already exist in PS and add "really big and scary" to them instead of "something that looks like them".