Boot up CS2 and head on over to the settings in the main menu. You’ll want to select the Keyboard / Mouse option from the menu and then Movement Keys. Here you can change what your jump is bound to.

I want a setup where in my left hand I have a move navigation controller running through motionjoy, and in my left: a mouse. sort of like the splitfish fragfx but I don't want to get I know this can ...

The Jump command is assigned to [SPACE] in CS2 by default, but if you want to re-bind jump to your mouse scroll wheel, you can do so using either the in-game menu or the console. However, using the ...