Found this thread looking for examples to set the Ratings metadata field. Thanks!
One challenge I had with adding a menu similar to this was having icons for it. So I made variations on one of the included 'large star' icons that shows 5 levels of being filled, to mirror 1- through 5-star ratings. Attached a zip with a DOpus menu button xml and the images to go with it, for any interested.
StarRatingsButton.zip (25.4 KB)