Automatic working plane with 3D control points

[JBenghiat 193]

I've noticed that because control points use the 2D selection tool, snapping is generally limited to the screen plane or layer plane.  Is there an easy way to enable automatic working plane after clicking on a 3D control point, possibly with a gSDK->Tool command?  

 

I've had luck detecting some special cases and setting a working plane for the control point move, but the only way I can see to allow for automatic planes is to call a custom tool.