Good point. I guess there’s only one way to find out. I’ve already successfully created a 7.1 mix from the original stereo tracks and included it in a quicktime file. All the tracks are there and it sounds fine in headphones and speakers.
The only downside is if I’m rejected from iTunes submission because it’s not “true” 7.1 surround. Technically it might be but if I charge more money for rental or purchase of the HD 7.1 version than the SD stereo version, they might take issue with that. But I have no issue with it since it sounds fine either way and the HD looks much better.