Add little feature regarding urls

[TitanFighter]

In my project users may custom their addresses, so if they want address may look like site.com/kuzia, but by default address look like site.com/id123. For such customization I have a field user_url.

Imagestore uses <username>:

    url(r'^user/(?P<username>\w+)/albums/', AlbumListView.as_view(), name='user'),
    url(r'^user/(?P<username>\w+)/$', ImageListView.as_view(), name='user-images'),

which in my case does not work and need to be changed whether in urls to <user_url> or in views.

My little 5 cents - could you add to the settings such option like: USER_URL_FIELD?
Thank you.