It's pretty rare to need more than 64 instruments, but for the few cases where it's needed it would be very useful to have more slots available. So yeah, I say +1 more instruments.
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Adding more instruments is possible but not trivial. Is it something that's actually (commonly) needed or just for this experiment?
Common? Of course not! But unique? Not by a long shot.
In the old Sonic 3 and Knuckles collab (that is still open), we ran out of instrument space so we had to split it up into 2 separate modules. I'm sure this has happened before and will happen again.
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"im going to continue making this crazy stuff then after a while my style will be so sick that you will be like damn suuun that shit is so sick i dont even get it. i will be like bro its ok.. you dont have to." -omgdonut