ok, I think I've come up with a method that will win the game for us. It requires strict adherence to the following rules:
1: no one strikes a light until there are two wagon with >66% of living players between them. Everyone votes as per normal, and every 25 posts or so someone posts an "unofficial" votecount to keep track.
2: Once >66% of living players are voting for one of two players, one of those players strikes a light and kills the other. If both the #1 and the #2 player refuse to do this (should only happen if both are scum) a volunteer will kill one and then another volunteer will kill the other.
3: One player will act as the "enforcer" killing any player who strikes a light prematurely. Each enforcer names her own replacement. I've volunteered to be the first enforcer, and I name Quagmire to be my replacement once I am dead. I choose quagmire because I felt he was pro-town but would be a distraction to the town. I suggest future enforcers follow my example. If the designated enforcer fails to do her duty, she should quickly be wagoned and killed under rule 2.
Why this will work: late game success often depends upon analysis of voting patterns. In my experience, from games I've read and played in, it is common for a scum player to be considered the second most scummy player whenever a townie is lynched. By killing both, the scum (when they are not bussing) will have to avoid voting for each other far more often than normal. In the late game phase it should become rather obvious who they are. If they do not avoid voting for each other the random walk of wagon should net them in the meantime.
Why you should trust me: either I will be night killed tonight, or someone will test me by striking a light without consensus tomorrow. Either way my alignment will be reveal soon enough. Also, my analysis should stand up to the scrutiny of other players. Beware, scum players may attempt to derail my plan either by nitpicking it or trying to confuse the issue. Since I am explicitly laying my life on the line for this, I think I should get the benifit of the doubt.
Warning to scum: this is the only part of mafia I am actually good at: abstract game analysis. If I am correct in my analysis (and I am quite confident of this) you will be hard-pressed to counter it. Feel free to try though