Whoa. Exactly how many tracks is there in that song of yours?
Anyway, you provide a great case. The Track Grouping suggestion is related, but it doesn’t involve the pattern matrix. But it definitely shouldn’t be too hard to extend the concept of groups/folders to that part.
While such a feature would allow “cleaning up” the horizontal (track) axis, I’ve been toying with the idea of introducing a similar concept to the vertical (pattern sequence) axis as well. Seems like they could work together just perfectly!