The guarantee of at least once as scum is very problematic. Obviously, if someone gets to game 7 without having been scum, they are screwed and town gets a free win (meaning someone else gets screwed out of a point arbitrarily). Even before game 7, anyone who hasn't been scum yet is in danger of being auto-lynched for completely legitimate reasons. (Say day 6 I haven't been scum yet - well, surely the mod wouldn't let it go to game 7 and make that one an autowin, so I'm almost certainly dead game 6, either giving town a free win or, worse, decreasing my expected points game 6 and then autolosing game 7.)
Anyway, even without this it's definitely outside the realm of Normal. If you can get players for an extended theme game, though, ~shrug~