Originally Posted by shiv_379
Linux doesn't support plug&play style usb devices?
Yes, but X doesn't. However, your xorg.conf is configured to read /dev/input/mice, which is the multiplexed input for all mice, so it should be working OK, even if you plug it in after X has started. Have a look in /var/log/Xorg.0.log to see what mouse/mice it's using.
Oh, and is there some reason you have Emulate3Buttons on? You usually want this off for wheel mice.