I don't usually hang around on meta, so not sure if this has been discussed before. But just a suggestion.
Seems to me one of the silliest, most frequent duffs that happens on gamedev (and SO as well) is the posting of subjective questions.
Just as the SE sites suggest existing questions to prevent you from re-asking the same, and will also suggest what might be subjective, could we not show a note in bold, every time the "ask question" page is hit, that tells users to that if they have discussion-oriented or otherwise subjective questions, they should take them to gamedev.net (or other game dev sites of a similar sort), or the forums of the technology relating to their question? It's a bit silly when newbies post questions about obscure engines to our forums first and foremost, flattering as it is to us all, when they should really be directed elsewhere.
Anyway, I'm not sure whether the policy of SE allows suggesting redirections to non-affiliated sites. Though I'd think that'd be sad, since I know there are a number of us who have been long-time denizens of gamedev.net (Kylotan, myself, and I recall seeing others).