Ok, here is what I was wanting to do:

I'm using spruceup to create a title set. Spruce up does not support .dts. I have a vob trailer that is in dts format. If I import the .m2v stream into spruceup and then create the title set, can I then replace the ifo files and .vob files that spruce created with the ones that I have with the audio stream in it and have it playback once I burn the dvd?

I don't know to much about what goes into making the dvd, so I don't know if there are other files in the title set that would require modifying.

If any of you pros out there can help then thanks in advance!!

And on a similar note, is it possible to edit the title set to add menu music?