I liked what qwerter did in his mafia of the mafioso having to find eachother, but it felt like when he changed the rule mid way that mafia can find eachother by targeting the same person it just negated the whole strategic factor
There was the suggestion though that 2 of the mafia know eachother at the start, which I think would keep all the strategic factors in balance and make this once again a really cool looking mafia :p