As I said, my policy there (and later at Minicon) accepted use-names. I could be dd-b, Blue Petal could be Blue Petal (there's a rumor that he did eventually make that legal; I dunno, but for a LONG time it was the only name anybody knew him by, regardless), etc. It does sometimes make a small amount of extra work, when somebody turns up with a new one.

Even that can be simplified by a policy where you *always* display the official name (the one they can show ID to claim the registration by) and also let them put another name if they wish.