How to get rid of different mouse tracking speeds on dual screen setups

Solution 1:

I don't think you can. Read this article on TUAW:

that's because the mouse speed option cannot be set on a per-monitor basis. Mouse tracking is controlled as part of system defaults, in the Universal Access preferences pane.

The actual preference is called mouseDriverMaxSpeed and can range as an integer between 1 (lethargic) and 32 (zippy). Here's how you'd read the current setting from the command line:

defaults read com.apple.universalaccess mouseDriverMaxSpeed

Whatever number you set to feel right on one monitor will either feel draggy or hyper on the other.