Hey! Thanks for the suggestion. We're trying to keep Among Slimes default games as fair as possible with games sharing the same amount of imposters. Currently if games have 6 or less players, 1 imposter is selected. If 7 or more players are in the game, 2 imposters are selected. Sadly we do not want players to be able to select the amount of impostors there are.
Also in my opinion, this can make games too easy. You could keep voting for 1 impostor and get easy wins. And some players would argue that if ranked players have the ability to vote for the impostors they can farm wins easier. Which is why we're not considering impostor amount voting in default games.
Now as for private games. Because statistics and rewards don't add onto your account, we're considering customisable private games. So the private game owner will be able to vote for the amount of impostors and tasks etc, and other game settings. But that's for a future feature!
I'm voting "yes" for private games, but "no" for default games. I'm assuming that the poll is for games in general, so I'm voting no.
Thanks! :D