That damn rudder

On FS2K2 I have installed two controls:
(1) MS Sidewinder Precision Pro (USB) joystick and,
(2) CA Pro Pedals (USB).

Rudder control with these two beasts fighting each other has been my main
dissatisfaction with the simulator.

What I want to do is to completely disable the twist control of the rudder
but the only way I can see to do that is to reduce the sensitivity of that
axis to zero.

The problem is that even though I do that the twist remains operable and to
add to the frustration while observing the rudder in spot plane view - and
close up - the rudder is obviously baffled by the inputs and moving
erratically and sometimes not at all. Just not operating the twist doesn't
help with the problem either

Hope someone can give me a new slant on this problem.