Would be great to save the develop settings of the virtual copies as xmp files as well. Often we make color & BW versions or use different presets for the same image. Why not to save all the versions either in one xmp or as separate xmps? So that we could share it with a retoucher, for instance, without converting to several DNGs. Or in case we lose the catalogue file, we'd preserve not only 1 version of the processing.