set404Override and debug toolbar

The site uses set404Override to route unmatched URI's to a controller/method thereby facilitating domain.com/username lookups.

• If the username is not found, we display the 404 view
  
• otherwise we show the matching user's profile.
  

If we route "/(:any)" to the same controller method, the debug toolbar is displayed, but it breaks automatic routing.

set404Override is a better solution for our needs, if not for the inability to show the debug toolbar in the "development" environment.

note: we attempted redirecting when a matching profile was found, but that doesn't seem to function normally when attempted within the override's method.