As the description of the module says that it accepts the D.O usernames. I th...

As the description of the module says that it accepts the D.O usernames. I think our understanding of Drupal username is with the username field value that we have at /user/{uid}/edit page and it would be a good idea to use it instead of URL slug. I would vote to go with the first proposed option to 'Remove the prefix and accept a username'.