"Dominant" Selection Settings for Curves on Surfaces

is there any setting that allows me to select at which radius it should select curves dominantly?

for instance if i have curves on a surface in shaded mode it often happens that it pops up the object choose panel, though sometimes i seem to manage to select the curve without having it pop up anything on the same model just a curve aside with not apparent consistency, precisely clicking on both directly on the curve with multiple tries, one side does one side not, maybe a matter of camera perspective.

i found Rhino.Options.ModelAid.MousePickBoxRadius but that just generally seems to broaden the radius for all objects. i know there is selection filter, but i would like to avoid having to activate that on the quick run.