In theory a setup like this should be able to work, but in practice the sampling behavior, velocity clamping, and aim acceleration would probably cause it to be all wonky.
Its an officially licensed product. Sony is even promoting this thing now, you have Sony folks on Twitter tweeting about it as if its a good thing. Find it pretty gross. If you want to play KBM go play on a PC.
Except that the mouse isnt reporting absolute position, it works like a non self centering stick in this instance, only activated by motion.
Any advantage you have in mobility of your wrist vs thunb is absolutely negated by the mechanics of how these things work. They dont report position accurately.
In fact, having used these types of mouse solutions - they are typically WORSE than a conparable analog stick.
I'm sure it works but I doubt it's any good just from experience from playing on pc at 30fps with a mouse or UT3 on PS3. It's okay. Just about, but not really. Not sure about without a real mouse as well but it probably won't help.