The WB-Sim C172 Enhansement Mod has the option to set (and state save) the Rudder Ground Adjustment tab. that can be adjusted so the plane flies straight in Cruise.
Note: This is NOT pilot controlled, rudder trim – the C172SP does not have that … but it is the fixed Ground Adjustment tab, that, for realism, can only be adjusted when the plane is on the ground, stationary, with the engine not running.