its FASTER,more intuitive and more creative to have this visual referece like this:

please add one.
the piano roll would be more FAST to use, if using :
Left mouse button to move and drag
right mouse button to delete
and if you dont want to do it because of the macs just having one button, that was the past theres the mighty mouse.
so another option would be to still use just one tool but using left mouse button + shift to delete , and left mouse button to move and drag.
Ableton live Rocks ! this things of the piano roll suck