You should suggest some sort of badge for this. I suggested one for commenting edits, and Jeff seemed to think it was a good idea. I think what you are asking for would be really good if it were some kind of public badge, the way moderator is.
I've created a request here:
I think ideally we would have two badges here. The first badge would be for selecting an "accepted answer" for, say, 50% of questions asked. The second would be for upvoting at least, say, 15% of answers to your questions (maybe more?).
Both of these badges would be best if they were volatile badges, in that they would come and go based on continued good behavior on the part of the user. e.g., If your "selected answer" ratio falls below 50%, you lose the badge.