concave & convex button for the vraycurvature map

[HeKroeber]

Hi
i am working an a material for simulating a weldseam with the vrayedgemap in combination with a noise and the vraycurvaturemap. For this it would be nice to control the vraycurvature with a convex/concave switch as in the vrayedgemap.
is it possible to get such a switch?

Regards
H.Kroeber