Configuring DotNetNuke displayname's to be the same as username's

When playing with the DotNetNuke OpenId authentication system, I decided I:
1. Didn't want the OpenId module to set the UserName to the OpenId id
2. Didn't really want separate display and user names any more

Haven't worked out a perfect way to do 1 (haven't worked out how to import an openid profile while still allowing the user to specify their username

But the second one was simple thanks to this post:
http://www.learnmsnet.com/post/Remove-Display-Name-from-Registration-in-DotNetNuke.aspx

So the answer:
- Go to Admin -> User Accounts
- At the bottom of this page choose User Settings
- In the User Settings, set Display Name format to [USERNAME]

That's it :)