Workshop

A standard kill, a one-time kill; if the standard killer is dead, plus an ultimate kill with limitations, plus biting targets for the maniac, plus the maniac getting an ultimate kill in return.

As I understand it, there's only one standard killer, and the harsh randomness is harsh, and the town with mana has kills, so the mafia won't get far if their only killer is taken out early in the game. This will be interesting, by the way, to see how the mafia will cope, especially with a bunch of other neutrals, but it's a bit strange. For the sake of experimentation, it's worth a try.

What bothers me more is the abundance of kills in the town, rather than the lack of them in the mafia...

That's true. The mafia isn't needed; the town can perfectly handle its own destruction.

The probability of this is already low, but one or two events of this kind will add variety to the game =-)

I don't argue. It could be very fun and interesting. It's just that even this probability will have to be kept in mind when analyzing the game, which will make things a little more complicated for everyone. However, it's up to you to decide; you won't be the one sitting and writing everything down; you'll be munching on popcorn and laughing at how we'll be freaking out.