Improvement 1: In FL Studio the right-button swipe is used to delete notes in the piano roll. In Live the right-click just brings up the context menu. It would be better if right-click without moving (or within N pixels of the mouse position where the mouse was clicked) brings up the context menu, while right-button swipe deletes any notes the mouse glides over while holding down the button.
Improvement 2: Middle-button pan. Again like in FL. In Live the middle button does nothing, which I can't understand since all mice have a middle button these days. Either that or the way it works in Bitwig. I don't see any reason not to put the middle button to work.