I use an Apple Magic Mouse on my Windows7 machine running DraftSight. You lose the ability to "click" the scroll wheel for a third button effect, but I don't feel that justifies changing to a different mouse just for CAD. The only real issue I've had is with the extreme sensitivity of the zooming response to the Magic Mouse touch scroll. It was easy to end up with the whole drawing in a single pixel, or so large nothing was visible, and almost impossible to stop at the desired scale.

After much web searching, I decided to try the AutoCAD ZOOMFACTOR command - and it worked! It said my default was 60, so I tried 20, which is _much_ better. I don't see this documented anywhere for DraftSight, so I wanted to share.

Note that this is not the "Zoom Factor" which _is_ documented in many DraftSight resources. It is a one-word command you must type at the command prompt. I've been unable to find any GUI access to this parameter.