Good catch on the angles. I never cared for them, but, so far, those belts look ok when they approach the plane.
Does the BELT show up at the front/fwd cargo door on the -200/ADV for you?
Until now, yes.
http://img9.imageshack.us/img9/2192/56116709.jpgThe rear one could need some extra fit.
But I saw that one can define the parking spots to show special vehicles or random ones. Perhaps something like that prevents them from showing up for you, although I haven't edited any airport positions for this feature, just for the pushback.
When I adjusted it in 3D, all I got was the blue (vertical) arrow, so I could only make those adjustments.
No other arrows? Even when pressing a lot of keys to cause a huge movement?
I wonder if I making the distances relative to ground, or aircraft centre line
I think it's the model's centre. The values look like that, sort of like the payload and viewing coordinates.