The default keys are pretty awkward.

This setup means you can keep one hand on movement/jump/fire and the other on mouse.

Autohotkey code. I attached an exe for convenience. Otherwise you'll have to install AHK, paste that into Notepad and save as "keys.ahk
#InstallKeybdHook

*PAUSE::Suspend
return

End::
ExitApp

w::Up
s::Down
a::Left
d::Right

LCTRL::Backspace
LShift::EnterPAUSE key toggles on/off. END exits.

Space = Fire
WASD = Movement
Shift = Jump
Ctrl = Jump Back

Rest of the keys are listed here: http://wormsarmageddon.team17.com/main.html?page=abou&area=cont

The default keys are pretty awkward.

This setup means you can keep one hand on movement/jump/fire and the other on mouse.

Autohotkey code. I attached an exe for convenience. Otherwise you'll have to install AHK, paste that into Notepad and save as "keys.ahk
#InstallKeybdHook

*PAUSE::Suspend
return

End::
ExitApp

w::Up
s::Down
a::Left
d::Right

LCTRL::Backspace
LShift::EnterPAUSE key toggles on/off. END exits.

Space = Fire
WASD = Movement
Shift = Jump
Ctrl = Jump Back

Rest of the keys are listed here: http://wormsarmageddon.team17.com/main.html?page=abou&area=cont
If you don't like the current setup which is probably the most intuitive for young players, then use the F keys along the top of the keyboard for selecting weapons.

My way means you don't have to move your hand at all to press anything, F keys are closer too.

Use mouse for looking and whatnot.

If you use F Keys then you rarely need to move the mouse after knowing what you intend to do. So you spend most of your time with right hand at the arrow keys, left hand on the F keys and spacebar. Having it use the WASD keys would mean you would use your left hand for everything except maybe jumping, which just isn't very good for right handers like me D:

WASD is only good for FPS games and games like Alien Swarm, a top down perspective.

You suck :)

Suppose, I still think all-in-one-hand is better. You can still reach F keys.

can you reach F Keys while keeping your thumb near spacebar? and while roping?

I can reach them.

can you reach F Keys while keeping your thumb near spacebar? and while roping?

Nope :) Hadn't thought of that. I've barely ever played it.