See those subtitles? I want those. I can hook a new field into the thread creation form thanks to the hand-dandy hook thread_create_fields_main, but no equivalent hook exists for the edit thread form.
So what I'm going to do is add a thread_edit_fields_main, but if I give this add-on out, it'll require everyone to do the same. That's a real drag. It'd be really great if that hook existed by default; I see no reason why it shouldn't.