Agreed. Furthermore, DD 2.0 tends to sound much worse in DD mode, and generally needs to be decoded in Pro-Logic mode to sound decent. I figured I'd leapfrog over that and create a Pro-logic II soundtrack that could be stored and played back in 5.1 mode, especially since my receiver doesn't have Pro-logic II built in. Creating this soundtrack covered several bases at once for me. Plus, I wanted to see if I could do it.

"But you have to put it into perspective that the 5.1 mix takes up only about, say 10%, of the total disc space. So in reality there's not much gain."

Yes. 1.3 Gbs, versus 380 Mbs. And believe me, the video was maxed out as much as possible. I had less than 1% remaining on the DVD (I had to recompile a few times to get it perfect - which is tough, since it takes 20+ hours to compile each time.)