Based on the Thwack Point System (thwack Point System - Updated 5/10/2013 ) you can receive points on creating and having one of your FR being voted on. But would you see any value in having a chunk of points or a badge on having a Feature Request that made it to a Release notes document?
IMHO, this would help drive the quality and pertinence of the feature requests, and have those be meaning full to the community.