He should have been more detailed about his issues so people can help him better. Not just one vague question and let everyone guess what the problem is. I assume the OP was the that little boy in the first youtube link he provided. He did say he has this game with this wheel. Well at least in that video the person is obviously doing it wrong. It is a totally different and better wheel when the high sensitivity is turned on.
You can map the buttons in GT5 and on the wheel itself. You can basically use this wheel in any racer. Hold start+select, press the button you want to assign to the other button or pedal, then press that.