Control key
A touch typist who prefers to keep their palm resting on a fixed position has difficulty reaching a lower-left control, whereas they can reach a right-displaced control without palm movement. Executing a control-and-shift operation with a right-displaced-control involves curling the little finger slightly underneath the ring-finger. Control key combinations involving the upper-left of the keyboard, including the keys (1, Q, W, 2) require either moving the hand, or using the right-control key with the opposite hand.