I agree, I like the current UD rule. I have been UD'ed. It has not only been innocent, some mafia have UD'ed. I think having clear night times help, maybe post the first 3 night falls on the first day.
I am thinking of an Underworld themed game with Vampires and Wolves. They would get to hit/change someone or investigate. It could also be where both teams could both hit/change or both investigate. Or maybe certain days certain things happen. It would also have a doctor with vials, that either saves or curses someone. I am sure I can do it.
My roles would be random except rb, ice and hn would all be evil, besides that they will be random.
Sounds cool, remember that if a lycan bites a vamp or vice versa the person dies. Also you could have one human be the chosen one that could become a lycan/vamp hybrid. A double agent in effect. Three teams, Lycans, Vamps, and humans.