If like me your still stuck with a shitty old USB mouse and want to get the most out of it for CSS follow this link and increase the refresh rate
http://www.tinyurl.com/2cdd88. Takes less than 2 minutes to do and Ive installed it and tested it on CSS and Iam impressed, its makes the the pointer a lot more smoother and more responsive. Basically the program updates how many imputs per second are recieved I set mine to 500hz, you can test it in the program. Cool little tip got it from PC Gamer magazine.
Remember to read the read me as it may not be compatible with your mouse.