B) As the number of and power of night actions goes up the fun of being a VT goes down. The original game had set ups such as cop/doctor/5 VT/3 mafia. In this set up there is only one night kill and the town pretty much needs to lynch every day. Meanwhile, they can mislynch a couple of times so they can joke around with their role during the day. This last game, there were 3 scum kills a night, and with half the game being scum the town needed scum help to make a lynch at all. Meanwhile, more than half the town had a power role and was lurking as a result, making being a VT extremely horrible. I hope this makes sense. Your options are to either reduce the amount of VTs substantially, as in this game, just to reduce the amount of people who are bored with the game. The risk you run with that is massively slow day phases that result in no lynches, which is pretty much how the past two games have gone. The other alternative is to have any number of VTs but reduce the power of the rest of the game, so, one scum faction and only a few town PR.
And yes, the town mayor game probably shouldn't have a cop at all so as to force the town to lynch every day.