Bump...
@JimH, is there any chance of revisiting this request?
To wit - while a video is currently playing full-screen, there's the feature where you can use the up/down arrows to go through a list of functions near the bottom of the window that show the name of what's playing, the time slider, language selection, settings, and so on (the actual items that are available depend on the type of video file that's playing; for example, language is only available if there are multiple audio tracks). Once you get to the item you want, you can use the left and right arrows to make selections.
It would be awesome to add the Star Rating to this so that you can see and adjust the rating without having to pause the video, find your way to the Theater View Playing Now, scroll down to Ratings, adjust the rating, and then figure out how to get video back to full screen and resume playback. Quite honestly, the current workflow is so complex that most people just won't bother to make use of the ratings feature, which is a shame as it can be used to make things like Favorites playlists.
The proposed workflow shouldn't be all that difficult to implement and would make viewing and adjusting the star rating of the video file that's currently playing extremely easy for users.
Please consider adding this. Pretty please?