Hi, I've been trying to figure out how to disable mouse acceleration in OS X. So far I have tried three things: 1. Playing around with the Terminal. "defaults write .GlobalPreferences com.apple.mouse.scaling -1" had been suggested as a potential solution, so I tried it out. Sure enough it does change the mouse behavior significantly. However, it has proven to still have acceleration enabled to a great degree. 2. Mouse Acceleration Prefpane is available on the Internet, but it does next to nothing to improve mouse acceleration. 3. So far the only true solution that I have found is Steermouse, but it has its own bag of problems. First, the cursor is extremely shaky when drawing out lines; second, it has issues with Synergy where if both the server and client have this installed, the cursor goes haywire when moving with any button down on the client. I have tested each method by drawing circles in Photoshop. I started slow and increased speed; the results of the tests are attached to the post. Does anyone know of other ways to achieve 1:1 mouse acceleration in OS X?