The way I hacked it on a ClassicACS site was:
datamodel fix: add actual_first_names and actual_last_name to user table (so user could actually put in their name if they wanted to) and you can pull them back out if you need them at some point.
upon user registration: put the screen_name into the first_names field. put into the last_name field.
This way, all queries that pull first_names last_name will end up with screen_name, and you can keep their actual names somewhere else for future reference.
Is this what you were asking?
