I use a Saitek keyboard with pretty blue LED lights under the keys that I don't need because I've memorized the keyboard completely.

Up arrow = look up
Down arrow = Crouch
Left arrow = Move left
Right arrow = move right
Space = jump
CTRL = Shoot
Enter = Change weapon
Shift = Run

My hand layout is kinda weird. I press space with my thumb, reach to shift with my index finger, press CTRL with my middle finger (sometimes I'll press CTRL with the joint on my middle finger so I can reach enter easier, if I need to switch guns quick and don't feel like hitting number keys), and use my ring finger and little finger on the arrow keys. I'll reach to enter with my middle finger when the time comes, but I usually use my left hand to reach to number keys. Ring finger always presses up, and little finger always presses down. I always use my middle finger to do super speed / golden jumps. I can press shift much faster with my middle finger than I can with my index finger.

The end.