We manage a couple of Bugzilla installations. For some stacks, the Bugzilla admins manage many or even all products, but they still don’t have shell access to the backend servers. In order to make the live for those people a bit easier, I added a simple SQL edit form to the Administration page for those admins.
But be careful, what you wish for. As it is right now, my diff (against 3.2.8) uses the same DB-user as Bugzilla overall! So one wrong move and the admins could ruin the DB.
Maybe this is helpful either directly or as an example how to extend Bugzilla.