I just stumbled over this nice article, that contains a list of good-to-know files in /proc and what to do with them:
"Making Changes in /proc filesystem" (by Amol P Kesare)
In order to find it again when I need it, I'm linking it here
Making Changes in /proc filesystem
Making Changes in /proc filesystem
Jumping out of an airplane is not a basic instinct. Neither is breathing underwater. But put the two together and you're traveling through space!