Warning:
If you're playing on Soldat 1.5,
don't bump your usb polling rate. As it will make the "mouse button get stuck" bug appear very often and dramatically mess with your gaming experience.
If you're already playing on 1.6 rc1 or later, then go ahead. As I can confirm the bug as been fixed.
For the rest of the guide, it doesn't matter which version of Soldat you play. I highly recommend tweaking your mouse with this guide.
And don't forget to set your monitor to his max refresh rate ( point 2.6 in the guide )
I have the chance to own an old crt that can output 640x480@200hz. And the fluidity is out of this world!