Can either one of these recievers do the 6.1 fix where it will matrix the rear center channel on any 5.1 channel source regardless of whether its DD EX or not.? (Yamaha and pioneer have this feature). Also can you assign digital inputs. I know there is an optical input for CD/DVD, but i would prefer to use one of the coaxil inputs for it. So can I use the optical CD/DVD input for another source?