Workshop

I think your system has a significant flaw that really spoils the game. There are even several of them. Firstly, Mafia is much more interesting to play if it involves negotiation. What's the point of finding out the role of someone on your side if you can't cooperate with them in any way? Also, I would change the ratio between in-game and real-world days. The fact that several in-game days are played in one real-world day makes it difficult to follow the game (unless you're at the computer all day, of course ^^), and it also starts to generate too much chatter. Although, of course, it's a matter of personal preference. Communication between players would add more variety to the game, but it would become quite cumbersome, as not everyone will add all the players to their instant messenger, and there's no private tag, so only direct messages are a reliable option, but it's very cumbersome.