For those who don't know, the worn keys are for moving your character thru the game.
A = Left, S = Back, D = Right, and W = Forward. Note: I use my right moude button for forward is why it's not worn out. Been doing it that way since I could! Since Doom I think is was. I map the center mouse button for what the right button normally does (usually zoom, or alternate fire).
E = Use or Interact and C = Crouch. Only slightly worn comparatively.