Binding jump to Mwheelup?

I'm a ex-css player and i'm playing this game with a few friends. On CSS i binded jump to mwheelup & space and crouch to mwheeldown & ctrl, now i'm wondering if it's at all possible to do it on this game? As i try to bind it to mwheelup, and nothing happens, doesn't seem to pick up my mouse wheel going up or something (though scrolling through weapons works).

Any ideas?

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