Rene, yes, it would be a terrific thing to get DVD2OneX working on DVD files created by Mac programs, especially DVD Studio Pro.
Sure, the majority of DVD2One users are going to be doing relatively straight transfers of movies off commerical DVDs, one would imagine. But there's a fair number of folks out there who like to assemble their own combinations of extras or episodes (e.g., TV shows that come on 4.7 GB discs...one could combine two discs-worth together onto one new disc).
There is no IFOedit equivalent on the Mac, so we need to physically reconstruct video files using DVDSP, Sizzle, or other programs if we want to change the disc structure.
It's often the case with me that I'll want to have a disc with a movie and one extra, and will discard a lot of the other extras. I can do this in DVD Studio Pro, and create a menu, etc. How nice it would be to then run the whole thing back under DVD2One to shrink -- oops! didn't mean to use that word -- squash it to 4.7 GB size.
And I work with original short films, assembling them on discs for student and experimental filmmakers, and it would save me a huge amount of time on those projects.
Saving time is good -- more time to watch movies!
DVD2OneX is a wonderful program -- I've been pining away for software that would let me back up foreign-language films and preserve the subtitles. I love the way I can choose specific audio/subtitles tracks -- often eliminating some of the audio is enough to fit the film on a disc without compression.