PM handles .xmp files well by not populating contact sheets with them, and by moving them automatically when you move the matching image file.
So I got to thinkin'... why is this behaviour limited only to .xmp files? I use DxO Optics Pro which creates .dop sidecars. Is there any chance PM could handle these sidecars in the same way? Not sure how many different file extensions there are for sidecar files (plenty I'm sure) so perhaps in PM preferences the user could select which file extensions to treat as raw+sidecar?
I realize it would be an problem for some sidecars like Nikon NX-D that are put into separate folders, but for the majority of raw editors that place sidecars next to the image, is this a possibility?