if I strip 2 streams of audio from the movie that has 4 how can I make sure that the audio will still work when selected in the audio menu

I have just used InstantCopy and have just stripped streams 2(Surround) & 3(French) from the Simpsons keeping stream 1(5.1) & 4(director's), but now the old stream 4 (director's comment) does not work when I select it in the menu as it is now stream 2 according to IC which was stereo, so I have to select stereo in the audio menu to get it ply via that( I know I could press audio button during playback)

is there any easy way I can get it to work again with the correct menu button by using ifoedit?

I had the same problem with Monsters Inc choosing the narrator's stream instead of 5.1 when it 1st played but I changed something in ifoedit to get 5.1 to play on default by chaging it to (0x80 I think)but can't remember what I did

cheers