bind mouse1 "+attack; toggle cl_crosshairsize 1 1.75 2.5 1.75; toggle cl_crosshairdot 0 1; toggle cl_crosshaircolor 0 1 2 3 4 5; toggle cl_crosshairgap 1 -1; r_cleardecals; toggle cl_crosshair_drawoutline 0 1; toggle cl_crosshairthickness 0.5 0.1"

Tons of crosshairs:
bind mouse1 "+attack; toggle cl_crosshairsize 1 1000 5 100; toggle cl_crosshairdot 0 1; toggle cl_crosshaircolor 0 1 2 3 4 5; toggle cl_crosshairgap 1 -10 3 -5; r_cleardecals; toggle cl_crosshair_drawoutline 0 1; toggle cl_crosshairthickness 3 0.2 2 0.8"

Crosshair reset:
bind space "toggle cl_crosshaircolor 0 1 2 3 4 5; cl_crosshairsize 2; volume 0.3; r_cleardecals; cl_crosshairdot 0; cl_crosshairgap -2; cl_crosshairthickness 0.5"