Nah .. I'd leave it as is .. it's handy being able to leave linked forums off the list and that's the perfect way of dealing with it ..
All I'd do is add this behaviour somewhere in the manual so people know about it. I've got to admit I set this as no for my mod forum thinking non admin/mods would see the forum in the list, but it seems they don't anyway .. so I guess there might be others who have done the same. As long as the manual has this info it should be fine