This is where I fall down with Fritzing - I don't use PCB much; I'm mostly a breadboard man 
Have you been creating this from scratch or adapting the original scour.py optimized svg output script? It should be possible to nobble it fairly easily to add the options we need.
I need to get coding on this soon. I think it should be possible to get an entire workflow going (I've dubbed it FritzInk)