The problem with the Meta forum is that it is not only at the bottom of the list, it doesn't get much publicity. Maybe there should be little notes around the site saying "For questions about the ENBoards themselves, see the Meta forum at the bottom of the forum list on the main forum page" or something along those lines?
I think itt is obvious to most people when a post should go in Meta... it's just not obvious to most people that Meta exists. Once everyone has realized that there is a Meta forum for just these purposes, I don't think there will be very many out of place posts.
Anyway, no real problem... eventually a moderator will happen by and move this to Meta, and the problem is solved, and a couple more people will go away with knowledge that the Meta forum exists.