Additionally, some feature where you can start a community but define it simply as a combination of RSS feeds … essentially a feed aggregator. But one that others can share and subscribe to.
I think a bot could handle most of that.
Hackable front end is interesting. You can already run multiple alternative front ends. Lemmy world offer 5 I think. Then, they just need to be scriptable if that’s what you want.
Restyling the default one seems to be common though