Well, it’s not exactly pinned, it’s more of a second track list.
I had liked it, but over time I I gave it up, because I found it difficult to use- it’s not easy to move focus between the divided track lists, and sometimes I can end up with tracks out-of-view in the upper list.
What I think would be extremely useful would be to have a track attribute that would set the tracks’ zoom size to be frozen, and if there were an explicit key command to navigate between the lists, it would be great. It seems this might be less involved to implement also…
If pinned tracks were introduced, I would start using them right away for tempo, time sig, . (as opposed to Track Versions, it took me a while to actually use them in my work.)