Microsoft Sidewinder Precision Pro Trims?

[dega500]

I am currently using FMS with the Sidewinder precision pro joystick. All functions work great but the planes and heli's need trim adjustments. (Planes steer to one side or the other and seem to climb too easy with very little throttle. Is there any way to simulate a trim adjustment with a joystick? Maybe a perameter in a .par file or something? I am planning on building an LT-40 (My first R/C plane) after the first of the year and would like to get some sim. practice in. It will be awhile before I'm ready for the field so any help with making the flight a little more realistic would be appreciated.