The forum module appears to use the taxonomy structure for the forum structure. I could almost get away with setting forum_page as a taxonomy term but I'm sure there's some other issues that would arise; main one being the base path forum getting cleared when a forum node gets updated.
http://api.drupal.org/api/function/forum_page/6

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mikeytown2’s picture

mikeytown2 commented

related #810530: taxonomy hierarchy not taken into account when term pages are expired

mikeytown2’s picture

mikeytown2 commented

There is the forum table... nice