I got all of Jade Empire onto a backup DVD-r, by using: XISO, Bik compression, and Nero 6. Just run the contents of the Movie file through Rad tools Bink compression (availible at http://www.radgametools.com/bnkdown.htm ) I used a 45% overall compression, and lowered sound quality to 8b stereo. It doesnt affect actual gameplay, and the movies arent that bad exept for instances of quick movement. I dont know, but I thought this was better than deleting half of the contents of the game.
P.S. It took my Vaio 3 days to complete the compression