Controller Config: C-Stick jitter

[sl23]

Sorry, I'm a dope! was trying to configure using GC config!!! Right, found it.
I have tamed the cursor but it is still continuously moving, is that right?
Center: 20
Width :15
Height: 30
Dead Zone: 0

I understand what Dead Zone is, but what do the other parameters do? Anyone know? I couldn't find any descriptions, the manual is rather minimal.
Width and Height seem to slow down the cursor by reducing sensitivity of stick movement.
Don't have a clue what Center is.

But it would be better if moving the cursor was like older games. Move it and it stays there at the position when you stop moving the stick. Is this compatibility issue?

Thanks