We now have V1.3 of the DNG spec, with support for opcodes, which is great.
Now, can we the ability to put opcodes in DNG camera profiles?
Given all the hard work has already been done to support opcodes, this would seem to me to be a really value adding thing to do. It would allow profiles to be created that support specific camera/lens combinations. E.g., it would allow the Leica M8's famous "Cyan corners" vignetting problem on uncoded wide ange lenses to be addressed by a profile rather than having to rewrite all the image's raw data.