As it's once again Day 1, we have very little to go on until people start posting. Zexen's suggestion seems reasonable but I'll hold off bandwagoning until That Guy posts a response. Last time, the mafia were able to win by posting long expositions with reasoning; if anyone does so this time we need to look at these very carefully, and if you disagree with someone give reasons rather than accepting your fate.
The cop and doctor acted mostly in private last time; they need to be more active this time around (the cop by declaring as soon as he can, and the doctor by taking people's suggestions on who to protect).