It would be really nice to be able to sort by number of answers, and then to sort within that by date. Or alphabetically. Or whatever one wanted. I don't think this is currently possible. (Yes, ask.sagemath is old, but even the new "http://askbot.org/en/questions/scope:all/sort:answers-asc/" http://askbot.org/en/questions/scope:all/sort:answers-asc/ syntax doesn't seem to support a second sort, upon naive attempts.)