Another small update,
I got another feature idea from a comment another user made to me that will also hopefully be added in the next release.
A "prefix" can be used to describe many things. For a gaming discussion forum, it might be the platform a game is on, as an example. If you are requiring members select from designated prefixes, you probably are using them to describe something specific.
So instead of just having the Prefix field displayed like this,
I plan to add a forum/category based option that lets you customize the language string used in place of "Prefix", so in the screenshot above you could change it to "Platform" as mentioned above, or any other thing that makes sense for you.