The ones on the Sublinks roadmap are interesting, for instance the warning system: https://github.com/orgs/sublinks/projects/1/views/7
Create a way to create a warning system for users. For example, a user gets a warning for posting a broken link multiple times. We don't want to ban them for that. Or a admin gives a user a Warning with a reason. Create a rules system for auto actions like banning for some time or forever. Consider adding types of warnings. This should also track bans from communities for admin-level auto actions. The profile page shows strikes similar to Mastodon for Mods/Admins only and the user that owns the profile. Examples, warnings in each community, and bans. Rules will be applied to counts of warning types or total warnings over time. 3 warnings within a month is a ban for a month, for example.
There was also this list from a few months ago: https://discuss.online/post/12787?scrollToComments=true
Thanks for the Mbin link!