I'm having the exact same problem as the OP.

I've been coping with the acceleration using USB Overdrive since Apple made the acceleration change in 10.3, but now I'm using a logitech keyboard and cannot use any other third party drivers. I tried looking for any terminal commands or system-fixes that would allow me to disable the acceleration in Os X, but to no avail thus far.

Tried iMousefix, steermouse, controllermate, USB overdrive coupled with Logitech control center, but nothing will work with the logitech drivers.

Alternatively, I wonder if could be possible to manually map the media keys including the fn-key on the Logitech keyboard so I dont have to use the Logitech driver so I may continue using USB overdrive?

Any help would be greatly appreciated, I've spent a whole day trying to fix this.

I had no problem with the mouse when i test drive my Imac at the Mac store, put when brought it home and put it on my desk it was driving me crazy. PC users are used to sitting in front of a computer with limited space to move a mouse around. I have found that using the mouse on a Mac standing up feels more natural. When standing up you automatically use your whole arm to move the mouse not just your wrist. Notice how every Mac store has them setup on counter height desk and you just walk up to try them.