My forum has the need for users to be able to change their username when they want to. I know they can currently do this, but when they change their username back again, all posts written with their prior username revert back to the original username.

Does anyone know how I could enable users to post using a different username and have it "stick"? Or is there a mod that could give me that ability? I have searched, but didn't find anything.

Thanks for any suggestions.