Editing a forum node without an entry in the database "forum" table

I sometimes change nodes from one type to another by editing my database manually (wish Drupal could do it for me!), and then editing the node from within Drupal so that it can be placed in the correct taxonomy and stuff. I noticed that non-forum nodes that I transform into forum nodes are not listed within the forums, although they are placed in the correct taxonomy. This happens because these nodes have no entry in the forum database table. No matter how much you edit the nodes within drupal, and move them from forum to forum, Drupal doesn't create an entry for them in the database table, so I have to do it manually.

I know this isn't really a bug, but... if edit (or at least move from a forum to another forum) a node that doesn't have a proper entry at the forum database table, shouldn't it be proper behavior for Drupal to correct this and create an entry?

Consider this a feature request if you don't think it qualifies as a bug.