Dude, you're implementing new stuff faster than I can test it - no fair! 

Not so much a bug as it is a missing feature - if you try and convert a model that would generate a 'you forgot to group those objects message' in PCS1, now just nothing happens. Could we get a nice and informative error message instead? It's one of the most common problems people have had with PCS1.
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As for the autopathing, it's nearly working right, but I think you slightly misunderstood the positioning distances I quoted, and I just realised some maximum caps would be good . 

 Instead of this:
      path.verts[0].radius = model.radius*30.0f;
      path.verts[1].radius = model.radius*0.7f;
      path.verts[0].pos = model.offset + turret.turret_normal * (model.radius*1.2f);
      path.verts[1].pos = model.offset + turret.turret_normal * (model.radius*0.7f);
      path.verts[0].radius = spcl.radius*6.0f;
      path.verts[1].radius = spcl.radius*0.3f;
      vector3d n = MakeUnitVector(spcl.point);
      path.verts[0].pos = spcl.point + n * (spcl.radius*1.2f);
      path.verts[1].pos = spcl.point + n * (spcl.radius*0.9f);
It should be:
      path.verts[0].radius = 
min((model.radius*30.0f), 1000);    //Capped at 1000 - took a guess at the syntax)      path.verts[1].radius = 
min((model.radius*0.7f), 100);        //Capped at 100      path.verts[0].pos = model.offset + turret.turret_normal * (
path.verts[0].radius*1.2f);
      path.verts[1].pos = model.offset + turret.turret_normal * (model.radius
*4.0f); //What you originally had
and then
      path.verts[0].radius = 
min((spcl.radius*6.0f), 1000);    //Capped at 1000      path.verts[1].radius = 
min((spcl.radius*0.3f), 100);        //Capped at 100      vector3d n = MakeUnitVector(spcl.point);
      path.verts[0].pos = spcl.point + n * (
path.verts[0].radius*1.2f);
      path.verts[1].pos = spcl.point + n * (spcl.radius*0.9f);
And that should produce an appropriate cone. 

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Also, might it be possible at some point to allow an orthognal view option? This combined with the axis constraints would be incredibly useful for accurate positioning of elements.
Edit: Fixed stupid copy&paste mistake in code.