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This is should work though I have not tested yet just change the mod to what ever dvar you want and
up to activate crouch and knife to get the mod you could also add another crouch so you would have to prone
If you want to add this to your menu put in vstr sb and take out the bind dpad_up vstr sb
bind dpad_up vstr sb
set sb "bind BUTTON_B vstr g"
set g "bind BUTTON_LSTICK
Mod; bind button_b vstr sb"
this is just an example you can put in what ever you want