@Redcrown and Frodo
I think an important point with the DNG-panorama-support in LR is to not have to "bake in" any development beforehand, but keep the raw file data available from the individual shots, only then to develop after stitching.
I have been stock on the need to export parts as tiff before stitching when using 3rd party pano tools like Autopano, as it's raw support wasn't to my liking, but avoiding this temporary rendering step in the new(wish) LR DNG pano support has been a great benefit, delaying developing until after stitching. But... As reported, I've run into some highlight clipping issues recently that I hadn't expected. If this could be sorted, and an ability to rotate pano / align horizon, it would take care of most of my stitching needs.