I don't know if some people would find this confusing, but I'd love to have a separate entry in the folder tree where all the rigs marked "favorite" are automatically collected.
It would be a "pseudo-folder" in the sense that it shows favorite rigs from all over your library, but those rigs remain in their original location (like the so called "libraries" in Windows 7 that look like regular folders but collect pictures, videos etc. from various "actual" folders on your computer).