Custom categories introduce more technical complications than you might think at first, and in order to allow them we’re going to have to re-think some of the current UI. I don’t see them slated for beta 2, but I’m pretty sure they are on the radar. They may make the first GM release, but the schedule for that is not yet defined.
I hope I’m allowed to say all that. If not, my name is Shackleford. Rusty Shackleford.
-Bill