I agree that Bezier Curves in the Key Ed would be great. But keep in mind that the data isn’t really transmitted as a curve it is still a bunch of discreet data points which are visually represented by the curve. The curves make it much easier to edit all that data as if it were a single thing, but it isn’t.
My impression is that Cubase introduced Bezier Curves initially for track automation data with the intention of expanding that to the editors later. I’m hoping for 10.5.
Not seeing your 1 & 2 problems here. But heck we might not even be on the same platform (which is why we encourage folks to put DAW specs in their sigs. )