The thing to remember is that you can utilize the back button however you want... to an extent. No matter what you do if you hold the back button it will force quit any game running. So you could use back as a jump button, but if you try to use it as, say, the gas pedal in a racing game, you'll find that the game will be force quit after a few seconds of holding the button.
There is also the pad as a thumbstick you can use for generation two devices. In addition there is actually a way to simply tell if you are touching the pad as well so a game could perform one action for touching the pad and another for clicking it.
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