It's not like you're cruising around downtown trying to look cool with your seat back and one hand draped over the wheel. If you're racing, you want to keep both hands on the wheel for maximum control as often as possible, only taking your hand off to work
the shifter when absolutely necessary. From what I can remember, this is what the driver does in Forza 3. It may vary if the car in real life lacks an actual gear lever due to having paddle shifters or whatever, but for the most part, I can't say that the
game is too far off in this regard.