Thank you. The "single note per document" feature would be nice, but much more significant would be the ability to scroll continuously through multiple images from a single document, rather than have to select them one at a time.
I could also imagine the ability to use the arrow keys to quickly move to the next image in a document, and then from the last image in a document to the first image in the next document. When I come back from the archive I often have many hundreds or thousands of images to sort through. Speed, ease of navigation, workflow -- these are keys.
For me this is a near dealbreaker -- I find Tropy very awkward to use without it. I need to be able to fly through images quickly!