And now - technically that’s already possible by ARMing 4 tracks and live recording with a midi controller. The played notes should spread across the 4 armed tracks then, giving you the polyphony you want.
There just isn’t a way to “group” those 4 tracks and make them visually appear as one, and i don’t expect to see this honestly.
Another thing that is missing - but would be nice - is voice spreading or making sure that every note is always cycling through the 4 tracks so that it would always steal the oldest note played.