I think anything but zero should preserve the standard behavior. The reason is that it is fairly easy to make the saturation zero. It takes a dedicated effort t

I think anything but zero should preserve the standard behavior. The reason is that it is fairly easy to make the saturation zero. It takes a dedicated effort to make the saturation almost zero. I am not familiar with this particular color picker and the resolution on the saturation. I would imagine that setting the saturation to zero is easy by clicking on the triangle and dragging into the corner, in order to corral the picker into the point at which saturation is 0. Picking a close-to-zero saturation involves a dedicated effort.