There are lots of servers currently offering this game mode. For the question concerning innocents not having much to do, on one of the servers they can go around collecting gold ingots, once they have 10 ingots then they will get a bow and 1 arrow. This arrow can then be used to help the detective out.
The game is a nice idea but since you've mentioned it, I've seen several top servers with this minigame.
My question is, do we want to be like other servers and offer the same minigames, or think of new games we could add instead.
We have a few suggestions already for minigames, also. I don't want to deter you from suggesting in the future but our main concern is towny at the moment.