I seem to recall a request for new features that we may like to see, but I can't seem to find the tread. So here is a new one;
I would like to see a "Nominate for extra credit" button. A button for extra points when someone really puts in a lot of time and effort on a complicated problem. Have the moderators only approve these special cases. Make it worth it, like 10k points. This would have a great impact on having experts come back to questions that are taking time, and more experts would weigh in on the difficult ones.
p.s. for those experts that have more then a billion points, what would reward would you seek? The special case club? Different type of points?