So hey, I just had an suggestion, It might sound rather retarded but could also bring confusion which means more lying and more fun heh... So what I was thinking about ...
The troll would be a neutral role, And hes objective would be to get killed as quick as possible, The quicker he gets killed, The more points he gets.
Now one thing would be annoying about this Is that If he achieves to get killed quick , He has nothing left to do but has to stay whole game just for points, Perhaps let him do some other things while he's dead? I'd really not know what, But perhaps some suggestions? Some troll stuff? :P
Trolololo[color=brown]l :D