I dual-boot OS X with Windows 7 (Home Premium) on my MacBook Air and the trackpad is super sensitive in Bootcamp. It's not the cursor speed, but the accidental "mouse clicks" while moving the cursor across the screen that have become troublesome (I daytrade securities in Windows, and a rogue mouse can be an absolute back-breaker). The only resolution has been to disable "tap to click" in the Bootcamp Control Panel. I've seen dozens of aged threads across the web regarding the issue that unfortunately provide no real solution for this. Do you have any solutions of your own?