As another poster noted, racing simulators will never be able to do anything close to replicating the experience of driving a manual. In an actual car, there's a constant physical feedback throughout the entire vehicle, from the vibration of the pedal to the sound of the engine to the acceleration from releasing the clutch, none of which can be effectively simulated. It's easy to tell you're much more directly connected to the road and in control of your vehicle in a manual than you would be in an automatic, where you have an impressive, but imperfect, software intermediary attempting to translate your actions into vehicular control.