PC game controls

My suggestions, based on previous experience with
FPS (first person shooter) type games.

movement - W A S D standard movement keys (FPS)

crouch - X key (I used x as alternate for crouch before).

walk - Z key (I used Z for sprint before).

jump - spacebar (W + F + spacebar not too difficult).

grapple - right mouse button. (1 or 2 keys at the same time).

action - F key. The Matrix games use F.

draw / holster weapon - E key.

fire weapon - left mouse

switch weapon - center mouse (FPS games) but as a button.

Grenade - G key (FPS games)

PDA - Q key, not used often.

Pause - tab key

Reset Camera - C key

Manual Aim - V key, not sure I'll use this

After some experimenting, I changed things around a bit.
Still seems awkward to have to do press two keys at the
same time with the left hand.

Arrow keys can be used when the mouse isn't needed.

key assignments and (reasons, usually multiple key sequences)

movement = W A S D
jump = space (W + space)
crouch = F (W + F)
action = G (W + G)
grapple = right mouse (W + space + right mouse)
walk sneak = middle mouse (W + middle mouse (+G?))
draw = Q (all top row weapons stuff)
aim = E
switch weapon = R
switch target = T
shoot = left mouse
grenade = C or Y (won't use this often)
health = H
light = Z
binoculars = B
center camera = X (called HUD in game)
pda = tab
pause = esc