Would you like to be able to make some settings adjustments on-the-fly, like they can do in real life? You always see them tweaking the brake bias or differentials by turning knobs on the steering wheel in F1 and other motorsports, so it would only make sense to add that to Gran Turismo. It wouldn't be terribly hard to do, I don't think. You're either using the stick or the pad for steering, right? So witchever one isn't steering, you use up/down to select the adjustment, and left/right to tweak. Also, when you're using the wheel, there are four unused buttons: X, Square, R3, L3. Those could be used for presets, or other functions.