If you want to lessen the compression factor, can you delete the 2-channel sound from the movie, special features etc, if you have a 5.1 channel DVD player?
You sure can, just goto the ROOT of the menu (DVD NAME) and click on it, then on the right side where it breaksdown the audio formats, just make sure you take the check OFF of the audio formats you dont want included. Done like dinner! :)
Sorry I didnt make it clear enough. Generally you will see the difference in size, the 2ch will be 200+ meg for the movie, where there will be smaller 2ch audio for extras listed. Leave those ones checked! :)