I understand your thoughts about the user faults. So, couldn't you not try add advanced features per ini file switches? A little ini switch could allow that a "Mesh2NURBS" 3dm is shown at the export UI (maybe only at the export, not the save dialog). If this is selected, the meshing dialog will popup. Only advanced users would use the ini switch. And as a last warning for the user - if the meshing UI popup, it's a good sign that a mesh is saved only. ;)