"I've only yet had time to check out ANH, but the commentary track on it is very sparse. Loooooong stretches goes by with no comments being made. So all-in-all it's no big sacrifice to drop it to get better sound-quality IMHO "

I made a submenu that jumps to each scene at the beginning of the commentary. No waiting necessary.

"the subtitles don't come up by default, you have to select them to turn them on."

I went ahead and burned my own Greedo subtitles into the MPEG so I wouldn't have to worry about this. I wonder if DVDLab could let me "force" subtitles on, just like I "force" the commentary soundtrack when you enter the commentary submenu. I'll have to check.