Even then, in Windows, you can't scroll pixel by pixel can you? I'm not sure if you're familiar with Apple touchpads, but I've never seen anything emulate their ability to scroll at literally continuous increments. Even with my Logitech (that also switches) "free wheeling" still has a minimum increment. It's configurable, but it's just "jumping" relative to the Apple Trackpad mechanic.
Click and hold the center mouse button (scroll wheel). Notice the four arrows that pop up. While still holding the center button down, move the mouse up/down, and you'll scroll smoothly. I use this whenever I'm away from my mac.