Personally, I would like to see more action-y fic, or mission fic. Also fics exploring all the possibilities of this gigantic shared universe, planets, differing societies, non-humans and whatnot. With shippy fics, I'd like to see more slow-burn type stuff. Also long fics that deal with the main duo's backstories while acknowledging how psychologically damaged/disturbed they probably are by their ordeals. But obviously this is just my own taste in fic and I am not speaking for everyone.