Not sure that that can be done.
It can be done, since sush dvd's are on the market... But maybe there aren't any programs out there that can handles it.
Allthough... I have Nero Burning Rom 5.5 and in "dvd burning section" there is a choice you can make that says "dvd-audio". Unfortantly, mine is not enable, so I guess, I need a Gold Edition or something like that to use it... Any one has Nero that can confirm that you could make an DVD-audio? If so, what version must I have on the program?