Um, if you input rudder while otherwise remaining wings level, (which probably requires abit of cross-controlling, most planes tend to roll in the direction of rudder input) that doesn't effect your course all that much. You are effectively in a forward slip, the nose is yawed wide from the actual course of the airplane. (Remember, a plane turns *primarily* because when it is banked part of the wing's lift that was previously only supporting it against the vertical pull of gravity is now being used horizontally to alter its course.) And yes, the fuselage and vertical stab combined constitute a rather large area which tend to resist yawing forces and "snap" you back more or less straight when you let go of any rudder input. And, if you have CT on, your rudder trim is being automatically constantly adjusted to fly straight.