I think they sound like good ideas, but when it comes to making games, there's a certain comfort zone each maker needs. Sandy loves Harry Potter, so she did Hogwort's mafia. I'd love to play some steam-punk mafia, but when it comes to designing one, my head's much more stuck in the real world. So, the theme I'd really like to play isn't the one I'd really like to make. Though if I try a second one I might go out of my comfort zone.
As for people wanting everyone to have powers... well, I'm against it. Eurobricks games are drawn out (two months) compared to one or two weeks on most sites. So, it seems like you don't have a chance here to really cut loose (for me, I only got to have special powers in Dystopia, and that was the insane cop, so it was kind of a drag after it was revealed). I understand that you want something to do. But, you have to keep in mind that there are lots of people playing. There is a challenge for the cop, investigator, and doctor to finding the no-ability players to team with, and for the mafia to pick off the ability players before the no-ability ones. When everyone has a power, the mafia take down a power player every time they have a kill. It's a drag for the game runner, who loses a big piece of the game, and gets rid of some of the balance in the game. There are ways around this, to keep the game exciting for un-powered players, but I think "everybody has powers" is like playing a video game with cheat codes. It's okay for one game now and then, but to make it the norm would make mafia a lot more boring. Unpowered townies are an important, useful play dynamic. Play a few rounds, and your time will come.
The other (non-Eurobricks) games I've played tweaked the systems to increase the novelty and enjoyment. One game had a split mafia, one of killers, and one of recruiters, who won together, but didn't know each other. So the two mafias had to figure out a way to reveal themselves to each other in a trustful way without releasing their identities to town. Another had three mafias, no town, and the last remaining mafia won. But, the players didn't know who for sure was on the other two teams, so kills and voting was the only way to know.
There are lots of ways to jazz up the games here. Interesting themes is one, but varying gameplay would possibly make things interesting for all players.