TBH I've been an admin/mod in several forums over my life and I always hated the idea of changing usernames in the first place
^^ This, usually. It's worse when they start using a new set of graphics to go with their "new persona". To be fair however, I can also remember picking a really stupid username and being glad I could change it. shudders
So I'd have to make multiple hits against the database to check if the following users exist:
John Frikkin Doe
John Frikkin Doe how
John Frikkin Doe how are
John Frikkin Doe how are you
John Frikkin Doe how are you today
See the problem?
I thought about this while posting the thread. I think I'll just disallow spaces in usernames
But hey, thank you for the extensive reply!