Ideas for an extension with current events:
- Use core.memberlist_prepare_profile_data to modify user's profile, e.g. add a predefined rank for banned users.
- Use core.modify_username_string to add a tag to username, e.g. aleha(Banned)
For the ideas above you'll pay an sql query to the banlist table.
I don't think that this should go to core so feel free to post other ideas or comments.
PS: Does core.memberlist_prepare_profile_data apply also to the mini-profile data shown on the right of each post on a topic page?