Hi Phil,
I have a router equipped with a 4th axis but my cam program (Cut3D) does not produce toolpaths for a 4th axis so my workaround would be to create the 3d model in MOI3d, unwrap the object into a 3d flat object, generate the toolpath with the CAM software then feed the 4th axis with the unwrapped axis gcode. That should reconstruct the original object.

Gaston