Hey Steve, sorry if I wasn't clear, it's the lines on the resultant subdivision mesh that would be better being gray and able to be disabled. In wireframe view, it shows the control mesh's lines black and the resultant subdivision mesh's lines gray, I think that gray color (or a few shades darker of the currently applied material?) should be applied to the resultant subdivision mesh's lines in all the views. I have no issues with any of the other aspects such as color, transparency or what-not of the control mesh.
It may be worth experimenting with culling out back-facing/hidden lines on the subdivision mesh, would make it a lot easier to read the resultant subdivision mesh especially if in wireframe view or with semi-transparent materials.