Add keyboard shortcut that hides/shows pancaked timelines

Hello,

One of my favorite editing techniques is pancake editing, which involves stacking two timelines on top of each other in my Premiere workspace. In my case, I usually have a sequence with all of my source footage on the top, and then my actual working sequence on the bottom.

Something that would save me a ton of time is a keyboard shortcut that would allow me to hide/show or collapse/expand the source timeline vertically. I find myself spending unnecessary mouse strokes hiding and adjusting the height of the timeline. Keyboard shortcuts that could eliminate those mouse strokes would be awesome. Maybe even shortcuts that let me change the height of both timelines at the same time, by changing the latitude of the border between the two sequence panels?

Thanks!

Danny