Lol, s/he is referring to the N9/N950 feature, though showing that he doesn't actually give a shite about it. Just say it: "I want to make my N900 look like an N9"

Back to topic:
The feature you are requesting deals with the accelerometer, for detecting taps from the screen. It is pretty do-able, but whoever attempts to implement it should rewrite the driver responsible about that, which is waaaaaay above my little coding skills.