Open multiple clips at once (on same track)
In the spirit of my unending abuse of the piano roll, I've got another one for you. I'm not a big fan of the surgical feeling of opening and closing single clips to track notes, as if each one has to be held open with forceps and completely covered on all sides like a patient.
Why not allow double clicking of other clips, but instead of changing the "active" open clip, allow multiple open clips, and the double-click is a toggle action. To close them all, hit escape. Hit escape again to exit edit mode.