Gamepad, stopping throttle axis from being auto-centered

Did someone try to tweak their gamepad so that the throttle axis isn't
automatically centered? I never had a gamepad before so I'm not sure if
this is possible. Can some gamepads be tweaked to behave in such a way by
either software or a dedicated switch? If not would removing the spring
work? Other axis on the same stick should still be auto-centered.

I was thinking about getting one these two Logitech gamepads but if you
accomplished this with any other model please tell me which one.

Denis

http://boutique.3dchips-fr.com/images/4788.jpg
http://data.techdata.cz/img/529623.jpg

Denis,

I use a logitech gamepad quite often. I know of no way to stop the
throttle from auto centring short of physical modifications that would
mutilate it and take several broken gamepads to get right (if you can).
If you work out a better way let us know.

I use the 2 buttons on the front of the controller for a throttle. One
to increase and one to decrease. It helps if you bring up a panel with
a throttle gauge on it on the screen so you can see where your throttle
setting actually is. That makes it quite flyable. I've landed
everything from Cessnas to F-18s to 747s well using a gamepad.