I think you're probably right about the need to hack the admin panel page, but I admit, that looks a little more intimidating. Not sure if simply copying/pasting the right syntax won't mess with the database in unexpected/damaging ways.
Yeah, I've been looking for a plugin, but I'm surprised nothing has turned up after a day's worth of searching. I just searched again, and found this:
Last updated in Feb 2010. A the time of this posting (for the benefit of future researchers), this seems fairly recent, so I'll give that a shot. It may even have a built-in mechanism to do what I've been originally trying to accomplish. We'll see. Thanks for your guidance on this!
UPDATE: Scratch that. Two users report this plugin is presently not compatible with WP 3.01 (most recent version). Back to square one.