I think Cubasis could benefit from these features. For example, in Animoog I love how you can set up the keyboard to only show the keys you want or the keys from a known scale. This makes playing on the touch screen much easier.
Also I love how in korg gadget you can make it so the piano roll highlights scale notes, or it only shows the notes on the scale or just shows notes currently being used. This simplifies writing midi tremendously.