Collaborate with others to mark files from a large number of photos.

If I have a folder with 500 images, at the the moment it's just possible to mark an image with a star. But thats not enough to make a selection in several passes with one more teammanager. So I wish to have: In the overview, mark and comment photos with different statuses or stars (1 star, 2 stars, 3 stars, …) so that you and team members can make a selection from a large number of photos. (Top: Maybe a sync with Adobe Bridge?)