Or does it depend on the game's community if it is okay?

Unless stated otherwise i'd say it's okay. You could always just say it when submitting runs anyway, if something is wrong someone will eventually tell you about it.

"Unless stated otherwise i'd say it's okay. " Yes, if the rules don't say it, you can do it. "You could always just say it when submitting runs anyway, if something is wrong someone will eventually tell you about it." However I don't agree with that, you should ask before a runner before starting running seriously a game, else you might get an invalid PB/WR and you'll be sad.