I wouldn't worry too much about the time component. It's actually not that time consuming to mod a basic game, only a little bit more than running something like a coin game which is tricky only in the sense that it's easy to forget you're running it. Straight Mafia mostly requires running a search every day or two for 'Vote: ' and scanning titles for people trying to grab your attention, if one keeps the roles few and fairly standard nights go easy.