It seems there's a lot of unanswered questions with good answers (0 up votes), but no "asker"'sup votes or OP's activity. I think we could use a closing vote that would be :
-how old is the question/answer (more than 15-30-60 days)
-check if the question has a not-so-bad answer
-check the asker's recent activity
->if active, ask him to comment the answer or edit the questionreason allowing to make it better
->if inactive (15-30-60 days), close the question as "probably answered":
- Close an unanswered question older than 15/30/60;
- Check if the question has a not-so-bad answer;
- Check the OP's recent activity, and:
- If recently active, ask him to comment the answer or edit the question to make it better;
- If inactive (15/30/60 days), automatically close the question as "Probably Answered".
The unanswered list would be shorter and more accurate.