I don't know if you're still following this topic, but I was wondering if adding FA-style multi-select folders to promotes would allow users to better identify works which they publicly endorse and/or with which they are involved. Might be better than what I initially replied. 

I think y!Gallery's "From Others" and "Collaborative works" features are a good example of how this can be implemented.

http://www.y-gallery.net/helpdesk/faq/general/collabs/

http://www.y-gallery.net/helpdesk/faq/general/gifts/