Ok. I thought the limitation was "non video datastream" *while playing back* but perhaps it counts all sub tracks in total?

Also, the issue is not with # of audio tracks, it's the limit of what the menu can display - if you can't "see" which track you're selecting in the menu, that's the problem, and the challenge "thus far" with authoring a disc. It's been a desire to have one that one can select any of them *from a menu.*

There have been other attempts, but the limitation has always been what can be displayed, not what can actually be on disc.