I understand that you already use all that can be written inside the OBJ.
One things for all can be the view (camera) position. Along with the resolution (at least with the right proportion).
Usually I prefer to choose this while modeling.

Micheal, don't get me wrong, moi already do what's needed for rendering, but when you can push a button and voila' ....
I'm becoming lazy with the age.

Anyway nothing essential, but have the possibility to write 3rd parties exporter plug-ins can open the door to enhancement in the workflow.