Thanks a bunch, that did it! :thumbup:
Its the Z Axis, here is how you do it in case anyone else has the same Problem:
...
MapKey (&Throttle, CSR, AXIS(MOUSE_Z_AXIS, 2, 100));
MapKey (&Throttle, CSL, AXIS(MOUSE_Z_AXIS, -2, 100));
...
The 2/-2 values are the step size and the 100 is the timeout between steps in millisconds. The given Values work quite well for me.