if you bind your mwheel down/up , you will jump as soon as you hit the ground, this will make you faster.
In the other side, people can use scripts to automatically jump (AutoBhop)
You can install anti_kzhack ( ANti KZ+BHOP Hack) or download the plugin which will show the client's keys he press (DUCK, JUMP, WASD).. if he keeps bhoping and he holds his spacebar(jump), then he is a scripter..(if you don't have the auto bhop plugin).. If he bhop and keep pressing SPACE SPACE SPACE, then he is bhoping normally with no script