Just make it so that every member can change there name as often as they like, and then have a cut off day. After that, what would be ideal is allow a member to be able to change their name once and only once. This means when a new member signes up as "Beginernoobonzateevee" they'll be able to change their name once, and they'll know they can only chance it once so they'll change it to something they're going to be happy with forever. Also, members who missed the ability to change their names one last time will also get a chance without bugging the admin. The reason we get all these stupid names like Bruce lee and fixed pants is not becuase people can change their name, but they'll have the opportunity to change it back later.