I was just posting asking if this was a feature supported by itch or not, and since I made my post this topic popped up. Itch needs to add support for revenue splits, this would inspire so many more collaborative projects on here, once you cut out the potential for accounting issues, people who stop checking their account and sending payments a month after a game is released etc. This seems like this should be such a standard feature on any platform that handles paying creators. I hope it gets implemented at some point.