Word of advice. In big games, you are, of course, gonna make the mafia team bigger for balance reasons. However, two regular sized mafia teams in one game is not uncommon. Sometimes the second scum party are cults/werewolves, which I personal loathe. Serial killers and solo factions are also very common.
Just please try your best to balance the game. Put limits on powers if you have to.
I am the black sheep "of course I'm crazy, but that doesn't mean I'm wrong."-Robert Anton Wilson