set space as jump in settings and then do bind mwheeldown +jump bind mwheelup +jump boom

of course it is, mods wont be able to check it anyways

As long as 1 keypress equals 1 action, it's good. And this fits the bill.

helpful tips: -bind s to stopvideos and +back so u can mash s during the loading screen -bind w to +remoteview, +forward and r_pvs_optimization .1 some people do that (including me and betsruner)