Looking like a no from what I’ve seen, but other than creating a junk slide and attaching media to it. Is there a way to mark media as excluded from the tidying process? If not I think that would be a nice thing to add, it doesn’t even have to be added to the interface/db. Could just be a tag that the process looks for and filters by. That would make it easy to pull up and review your exempted list anyway.
Currently (bugs aside) tidy library will delete all media files that aren’t in use (ie not assigned on any layout).
I’ve moved your post to features category, so it can be considered in the future development.