Again a sidewards angle would be to find out exactly how the AHK kext's work on MAC OS, as they have released it for Nvidia/ATI and Intel I believe.
Obviously Mac OS and drivers are different to *nix/Windows, but it could help to find out how to make a tool to disable dithering across the board.
It's probably not going to happen, as has been said before, it checks for the hardware before it runs.