i know it's possible to write a .inf file that the user can run that will automatically change your configurations....but that's a pain..
other than that, i THINK i've seen something someone already made up that is basically a little program that will change it for you (but i think it still requires a reboot to take effect)
you might have to do some searching either here or on google to find it though...but perhaps someone else will see this thread and have an idea