Incidentally, the 300ms delay is not to prevent accidental touches, it's so the system can detect the difference between a double tap and a single tap. If you don't make a second tap within 300ms, it goes and fires the single tap event. But it can't do that until it knows for certain that it's not simply the first tap in a double-tap sequence.

The solution to this, if you're not using double-taps, is to respond to the event when it enters the initial phase (then the finger is pressed), rather than when it's released. I'm not sure if you can do this through javascript, but I know it's possible in Objective C by either overriding – touchesBegan:withEvent:, or implementing your own gesture recogniser.