Take out 5 channel stereo and 7 channel stereo and replace with one "all channel stereo" label. Again, receiver should put out signal based on the number of speakers that is set in the menu.
Let's at least have the ability to use this mode with a digital signal. The 1070 only seems to be able to use this with an analog signal - every receiver I've owned had this mode as an option regardless of incoming signal...I would think this would be an easy modification.