I was under the impression that if a Question and Answer thread were made, then questions would be asked repeatedly. I had no expectation that every member ─ or most for that matter ─ would honestly search the entire thread for their own question. It's far simpler and much faster to just post it again and have someone come up and answer it. That is, after all, the overall purpose for having one. This way, the common simple questions that arise aren't cluttering the lower board where more important questions, suggestions, and feedback can be given. To be honest, if you're expecting it's going to be a mess, then you're over thinking it; like Vrai said above.
It'll also be far easier to just expand the current "Where do I post this...? / Where is this...?" thread, which was suggested a few times above, myself included.
Reading your most recent post; We did have a sticky letting members know about ROM Hacking questions and where they belong. As you can see, that never actually worked out well enough and a permanent notice was put up instead.