Mouse wheel deals in local rather than global coordinates

[danielrh]

when you're on the mac and right click-drag and accidentally scroll a few pixels you end up near zero rather than near the scene: this may be because the scroll wheel uses the camera's world coords rather than local coords.
It can be very disorienting to a user since there's no way to undo a small scrollish action

[ewencp]

Out of date, controls are different now.