I like the games as they are now, but it is funny how the wolves seem to keep winning. I actually never read a game which ended in happily ever after, except for the recent Junior one.
So it might be not such a bad idea to give the villagers an extra gifted. I think the idea of a Hunter/Seer/Ranger would cause terrible confusion at least and probably instant suicide or death of the entire village. But boosting the Hunter a little or maybe try having another gifted villager with the power of once being able to kill during Day, might work out.
Though in the end, I still think minimalistic games are the most fun.