1. When user selects a prefix, they are now displayed in ABC order or order of most used.
2. When user selects a prefix, the prefixes are displayed in plain text. I like that I can see the nice version, but some of them don't appear very well due to color coordination issues.
3. An ability for forum admin to display all available prefixes for users to sort by. Sure, they can already see them next to the threads, but it may helpful to display them in some sort of menu for users - sorta like categories and how flarum looks - @Russ pointed out flarum to me the other day. I haven't heard of it until then, and there I was trying to find a way to display my prefixes to users.
4. This might be considered best for an addon, but if any XF staff like it, maybe we can implement it in a future release.