In rereading what I just wrote, I noticed that my new idea could change things a little.  If there are separate namespaces as described, and if each is shown in a different section on category pages, then you could redo Fishbournes categorization like this:  ::Categories: 1961 [ ] |  Living people [ ] | United States [•] | Georgia (United States) [ ] | Augusta, Georgia [ ] | African descent [•] | Film [ ] | Television [ ]  | Acting [•] | Best Actor Academy Award nominees [ ] | M*A*S*H [ ] | Miami Vice [ ] |  A Nightmare on Elm Street [ ] ::[GO]  :::This scheme would combine many categories together.  For example, American people would be part of United States.  To make this work, perhaps each section of a category could have a show/hide button.  By default, perhaps any section with more than 50 entries starts out hidden.  If not, then the categories would probably be too huge.      