Running UBBT 7.5.3

We've customized our site so that the display name field no longer appears on the registration screen, and whatever someone enters for username is automatically his display name also. Now we want to change existing accounts so that each member's display name will match his/her username, and I have a couple of questions:

1) I've come up with a list of members whose display name is not the same as their username, but I'd like to cross-check it. Is there some sort of query we can run, or another way of producing a list so I can confirm mine?

2) For any members who want their display name changed to match their username, I can do that in the control panel. But for those who want their username changed to match their current display name, I can't do it via the CP. Is there a way to change usernames? If so, is there a way to change all the accounts with "wrong" usernames, so that their display names becomes their usernames?


Running UBB.threads 7.5.5 as of May 23 2010