Key combination to enable two-finger scrolling with mouse I am currently using a trackball and I am not satisfied with the scroll wheel. I wonder if there is a key combination to enable "free roaming, scrolling" mode, which locks the mouse and scrolls the screen according to the mouse motion, just like two-finger scrolling in trackpads. So that I will map the extra key on the trackball with that combination and scroll around with the ball while pressing that button.
Okay I actually found it. I installed Keyremap4Macbook and mapped CursorMove to ScrollWheel.