On many of the Stack Exchange sites, a significant proportion of questions are asked by unregistered users who are then unable to accept an answer to their question as correct. This is a massive disincentive to answering questions from unregistered users, given that the probability of reputation gain from that answer is significantly lower.
I have one such answer that has been left un-accepted despite receiving 35 upvotes (and 0 downvotes) because the OP is unregistered and thus has no means of accepting it.
Could there be a way to automatically accept answers to unregistered users' questions once they reach, say, +5 votes? This rule would remove the disincentive of answering many of the posted questions, and get users well-earned reputation points.