I know I'm coming in very late to this party, but I'd like to speak up since I am a non-moderator. This site--and especially its policies--seem to be very much "by the moderators, for the moderators" as of yet. As much as I love the moderators--and seriously appreciate their work--there isn't much of a community here so long as that's true.
Mi.Yodeya is considered the "Jewish" category of Stackexchange; its tagline is "Jewish life and learning." ("Learning" to most people does not necessarily mean "Torah learning" as it does to Jewish-English speakers.) As I mention here, the site's topic is "Judaism" rather than "Yiddishkeit." I propose that we edit the in- and out- list to reflect this reality.
I'd welcome ideas about how to classify a new, slightly broader scope. One idea would be to allow any questions that might be addressed within the Jewish Studies department at a university (assuming the university has a separate Hebrew department). So Hebrew language is out, but "Do Jews consider the New Testament part of the Bible?" and "Do Jews think plants are self-aware?" are in. Also "in": this category, which I think was very egregiously placed on the "out" list:
Jews, Jewish history, and Israel
I don't think this is the recipe for sitewide anarchy that others seem to think it would be. We have tags here for a reason. People interested only in halacha can search for items tagged with "halacha." Other categories can have their own tags. For now, almost everything is, or should be, tagged "halacha." That's hardly the whole of Judaism.
It's not torah.stackexchange.com;
It's not even yiddishkeit.stackexchange.com.
++Adding a piece to discuss why I think it is important to change the scope of the site, beyond being true to our domain name:
First-time posters with minimal Jewish knowledge frequently come to the site, ask a question, and don't stay. They take the time and trouble to register here--you have to register for each individual Stackexchange category, unlike in a place like Yahoo Answers--presumably because they are interested in the topic and hope for a serious answer to their question (and possibly more questions in the future). And they post a question--often exactly the questions we have to discuss because they are at the border of our current scope. What happens--not all the time, but often enough to notice--is that the questions are downvoted or closed for being off-topic; a discussion goes on in Meta and always ends the same way; the visitors leave; and we never see them again.
There is potential for this site to do actual good in the world--not that helping well-educated Jews with their trickiest Torah questions is not good!--and I think we should take the opportunity to do it. The fact is that if someone who knows little about Judaism seeks answers, they have only a few venues where they can get them, and none are ideal. They can get a very religiously-angled answer from Chabad's Ask the Rabbi service or another frum service, or they can ask somewhere like Yahoo Answers, where the likelihood of getting an intelligent, thorough, and fair-to-Jews answer is very random. We occupy an intermediate position, and, in my opinion, we should use it in part to make a good name for Judaism and share our Jewish knowledge for those at the greatest risk of not getting it.
At Isaac Moses's, suggestion, I went digging for examples of closed questions that I think should have been kept open under the principles I have adumbrated here.
It was shockingly easy to do so so.
I had hoped to write a little bit about each example, and explain why it fits within my proposed principles, even if it isn't a stellar question in other ways. (Many of these questions do need revision; please keep in mind that part of my premise here is encouraging newcomers to stay, and often newcomers don't know how to fit their thoughts into the form of a Stackexchange question.) But I ended up with way too many examples to do that for all of them. So feel free to ask about whichever ones seem puzzling.
(Please note that the questions below represent my selections from the first two pages of closed questions. There are twelve more pages of closed questions that I didn't go through. I hope this gets some message across.)
EXAMPLES of questions I think should not have been closed, per the argument above: