i've modified the custom tags to be group based (user groups)..
so the menus as well as the bbcode.inc.php parsing will check to see if a particular user is permissioned for the desired tag.
i did this initially, because i had a ton of what i'd call 'admin only' tags that i liked, but didn't want to release it to the masses..
it's a DB modification and code mod both..
so a further tweak to make it also forum based, might be a good idea...
i'll be forced to address this issue on a 7.4.1 forum by the new year, so i might have a mod available then..