Can´t say something about Xbox or audio-protections, maybe you found something here in the forum.
I know some Liteon and Optiarc can be modified with such a FW wth allows to overburn DVD-media, but not more.
And this nfo-infos are a joke. I know no one DVD DL-burner with offers 1x-speed for DL-media.
Bitsetting was never interesting for me because my first DVD-player could read all media, and that was 2004.
Actual Plextors are from Liteon
Both brands don´t sell BD-writer since years