Agreed, this would be nice to add. However, it would have been easier if everyone's primary identifier was a number, and a name was just an associated field. Unfortunately, it doesn't seem that it was set up this way. Someone correct me if I'm wrong.
Anybody known if emailing the mods will let this happen?
Maybe add a displayname "on top" that gets displayed in discussions, while still showing the username in the profile so people don't impersonate each other, add a button to "flag displayname" on the profile so that can be reset if abused or even the privilege to set it revoked -- done?