Why do you not use Abelton?
I can imagine that the workflow with Abelton is better for you.
I use cubase because it does not work like Abelton. 
I don´t need a fold feature in Cubase´s big key editor. That does not make sense.
hint: People use the key editor in ableton as a drum editor (!) a fold function is important in this case.
In Cubase we have a fold solution in the drum editor, that´s great and ideal in this editor. But not in Cubase´s key editor.
My opinion.