I perused most of the 23 page thread on EX/ES discs over at HTF. And I firmly believe that it is just not flagged on the disk. And I agree that Cirrus Extra Sound is the simplest and likely best way to have the 950 default with DD and DTS DVDs.

By the way, I'm heading over to Radio Shack to buy the 12v trigger cables because there is so little information in the back channels during most of the DVDs that I've watched that the amps shut off in the middle of my viewing and it's annoying me. In fact this happens in the surround channels in a lot of non-special-effect movies too.