EntropyTFMcCants
Your best bet is to upscale and downscale the crosshairs manually if you want different ratios. Choose a good cl_crosshair_scale then make some differently sized versions of whatever crosshair you want. This thread shows how to edit the vtf files and even make your own crosshairs.
https://www.teamfortress.tv/37767/how-to-make-vtf-crosshairs
MANY THANKS!!
i'll take a look at it