Suggestion

Hi! 

I really like the plugin concept and would really like to use it in my workflow. 

I have a couple of suggestions if you don't mind..

1. Add a skip tag so it doesn't processed the layer

2. Add a tag to scale up or scale down for Retina export

Other than that its fantastic!

I'm actually using a script i made myself to do my exporting, its similar to your concept but its just a barebone script, no fancy interface, and not really optimized :)