Mod to allow username change within first 30 days of membership

[vestaviascott]

I have a membership site that automatically creates usernames for forum access in the form FirstnameLastname.

I can already anticipate that I'm going to get deluged with support requests "How can I change my username!"

Its already happened in my beta testing of limited numbers of users.

Does a mod exist that will allow a user to change their own username (and checks to see if it already exists)?

I'm not too picky at this point, but if it had the ability to only allow this change within the first 30 days of membership that would be even better.

TIA!

~ scott