Piano Roll Workflow with shortcuts

I've been on a mission latelly trying to improve my workflow in the piano roll view. Mainly focusing on creating key bindings. One thing I found odd was that the piano roll has no default shortcuts in the key bindings list as well as in the online help. After discovering that shift+c shows or hides the controller pane, I was thinking that there might be other default shortcuts for the piano roll that I am missing.

A search on the web turns up only pre X series shortcuts for the piano roll that are no longer valid. Does anyone have a list of piano roll shortcuts for the X series? I'm currently on X2.

Many Thanks