Just got me one of these on saturday and love it. I used to have a MS optical mouse with a button on each side of the mouse that I could assign to use in games for certain actions. The buttons on the MX1000 wont assign to anything, as in the game doesnt seem to see them. Just the normal left,right, and center wheel buttons are seen in the games. Its not a super big deal as I can just map the keys to the keyboard but I would rather have them being used on the mouse. Just wondering if anyone else has this issue or if there is a way arounfd this.