Importing just the vertices should be straightforward and would help enormously to reconstruct imported objects by snapping new geometry to the imported vertices, so I'm still hoping Michael changes his mind at some point. :)
Hi Andre, there is a converter app here which will open an .obj file and convert it the polygon edges into line segments in a 3DM file which you can then load into MoI: http://moi3d.com/download/Obj23dmWireframe.zip
Press Tab and write _importObj
When you have import it : Select by Browser's button "Edges" copy move them ... you have segments as support new drawing...