I think bonus tab would be useful for offering additional downloadable items (mini-resources) with the resource itself possibly based on usergroup permissions. It might serve for something like rewards for members or timed promos for commercial resources or who knows for what else. It would also help the author to keep the main resource file to the point without bloating it or to avoid zipping. Anyway that's just an idea that I had while watching annoying trailers on a movie dvd. Mockup is below.