I will certainly play, but I voted GAH! on the lynch option. I've been in several games with a dueling system, and the one thing they all seem to lack is a purpose for the duels. They generally end up being a way for bored townies to do something else and don't tend to have much practical purpose in the game beyond entertainment. Your option is a bit more promising because it isn't optional and it is meshed into the actual lynch mechanism. Howeveer, I'm not entirely clear on what use the fight will be. Is the duel going to reveal info on the two combatants, so that the director can lynch one of them? If so, is that too powerful? In such a situation, the town will naturally gravitate towards pumping two suspects forward to duel so that they can both have a 'duel investigation.' If mafia are spotted in duels, that might be too powerful. At the same time, if the mafia are NOT spotted in duels... what's the point?

Again, putting them in for entertainment is perfectly fine; duel system do accomplish that relatively well. However, I'm unclear on how the duel will factor into the greater goal of catching the mafia and whether it would be balanced.