In case anyone was wondering whether there was any new development on this project, here are a couple of new screenshots. It looks like at least on Windows this is about to replace STICK, ASSIST and WASP (the Switch Partitions action is hidden in the screenshot, but it exists).
I also updated the software metadata proposal (the biggest change is the addition of encoding).
Since the camera (and model) can now be reliably deduced from the software, I'll be retiring the other metadata proposals (I still think the manifest idea is solid).