Roger +1
"IF IT WOULD BE POSSIBLE TO ADD MORE TRACKS, and if not, THEN WHY."
Unfortunately "Why" will not solve the issue. I would limit the choices to three.
YES, NO, MAYBE. That way, if there is NO hope, time should not be wasted on this very important wish. I believe It would be fair for developers or somebody who can speak for them to give a short answer, so this can be discussed or put to rest.

Pipeline,
interesting. I was imagining "+" button on the mixer, which would add an extra track "on demand" right above Soloist/Melody tracks. Up to 16 total, not including Audio or Through.

With extra tracks, for easy to understand/type in Bar Options, for holds, shots etc., this idea can be used:
https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Main=83441&Number=597158#Post597158

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ClassicMan, I thank you for starting this thread and I am sorry if it went unexpected direction.