Well, I've almost got my problem sorted out.

I was previously trying to find an easy solution to my dilemma: I needed a way to give forum moderators the power to control their board access (who can view and post) through MBCO.

I installed the Global Moderators modification, and edited the mod so you can toggle whether or not Global Mods can get into MBCO. So far, so good.

Now, how do I edit the $boardlist (the listing of boards that appears in the dropdown box in More Board/Category Options in admin) so that it only shows boards that the current user moderates?

If I can just do that, I'm home free and my life will be SO much easier.

Can anyone point me in the right direction?

Well, in the normal mod, that's true. But in my modification, Global Moderators can still only moderate the boards that they're listed as moderators under.

Any idea on how to do this in $boardlist in MBCoptions.pl? I'm confused.