It would make more sense if it was an actual bio-metric fingerprint or something. Pressure sensitive just wont work consistently, even if the sensor is super sensitive, that just means you will have to hold the controller EXACTLY the same every time or it wont work. Seems like a headache more than a luxury
Wouldn't it be cool if they actually developed proper biometric detection for their controllers? You could run a metal strip around the seams of the controller, that could read heart rate, and perspiration, deriving your mood, and changing the game accordingly. Imagine how much Dead Space could f**k you up, if it could recognise what scares you the most. Or what gets your heart racing the most in an FPS game, etc.