I have a tiny fader controller with horizontal and vertical faders that I would love to be able to use to control key-editor zoom. Currently in controller mapping, zoom in/out functions are only push-button assignable.
From a coding standpoint, all you’d have to do is give Cubase 128 levels of zoom in either direction, then let you map them to an absolute value for midi cc data. This would let them be assignable to fader CC controls.