I don't know why it never occurred to me before, but I have just realised that the "Link Tracks" feature also works with photos. I think it may have something to do with having to do periodic reminders to self that in MC, an image file is more often that not, a track.
Anyways, it works beautifully. Got a series of photos that you would like to always play in sequence? Link them and the job is done. Is there any other image viewer/manager that can do that? I'm not sure. MC is so good for photos.
I would love to see a build cycle that really focussed on our image libraries. It's beginning to feel like the forgotten child