Well, I was assuming 2 scum. probably a 10 player setup. In the end, 4 days on 10 players mimics a normal mafia game with a 1 shot vig (vig kills 1, mafia kills 1 a night, 1 lynch a day = 4 day lylo if 1 mafia dies). The 3 kills done by the mafia normally are instead 3 people the town doctor didn't choose.
As far as scumsided, note that those win conditions aren't combined. If the doc picks 3 townies, town wins. If the town lynches the scum, town wins. They don't need to do both. Finding 3 townies out of 9 people is technically much easier than finding 2 scum from the same group. The scum also lose their ability to wipe out strong townies to weaken the day game. I'd say it's slightly townsided in the end. To even get a chance for scum to win lylo they have to not only act town but convince the Doc that they are MORE townie than anyone else. Simply making others look worse isn't enough. If both scum are simply 'meh perhaps' to the Doc, it's game over, town wins.
Probably the hardest part of the game is keeping the Doc safe. Docs, by their nature, act scummy. Given HOW Scummish the Doc role is (Lynch is more of a problem than a benefit, more powerful in night than day, MUST live to win) it'll be VERY hard for them to play town. If they fail, though, the scum will 1-shot or the town will lynch the doc and it's game over.
Assuming the doc plays well, it's actually pretty townsided. If scum cant' find the doc, they have to not only be picked but also either shoot another Treated (a 2 out of 5 chance) or win lylo.
I have two ideas linked by one flavor concept: The cure to the disease can only be given on the third night. The doctor only has time to treat 3 people in that night. Meanwhile, the Mafia stole ONE cure.
This does two things:
1. The doctor doesn't pre-cure. Instead they Choose who to Treat. That means that they make the choice and act Night 3. This is why Doc dying = town loss: everyone but 1 mafia dies. This also means the doc is free to choose afte the third night, so no worries of picking someone Night 1 then the person being lynched day 2.
2. It eliminates the 'doc picks 3 townies and WIN'. I realize nwo that with this item in place the town's best bet is to just pick randomly and stay silent. Chances are, they'll lynch 3 non-doc townies, the doc will pick 3 townies and the mafia's one-shot won't matter. Going random will, chances are, result in 3 townies and a mafia with a 1-shot: basically a lylo (since mafia will NOT shoot before a lynch unless they are foolish
) and a nasty one for the town. The town is best off scumhunting to try to kill the mafia early or, at least, giving the Treated few ammo to use in lylo.
It also makes a very interesting mafiawin possiblity: Doc picks 2 townies and a mafia, the mafia self-cures the OTHER person. 2 townies, 2 mafia, mafia win. For mafia to win this way:
1. They BOTH have to avoid being lynched for three days
2. They need the Doc to Treat one of them
3. They need to know who the Doc picked and, thus, self-treat the other
If they can pull that off then, imo, they win. same for if they can get the Doc to Treat both mafia.
Which makes daytime scumhunting to kill at least ONE of the mafia, Very Important.