I was using 3ds Max 2013 and I realized that you cannot setup State Sets to send all StateSet to Backburner automatically, like in 3ds Max 2012 (with button "Net Render" at Render Setup), you must activate each StateSet by hand and send to Backburner. stupid, right?
It’s a very basic script but works perfectly. This script load all StateSets into a listbox (except Objects StateSet). After you click at "Render All State Sets", it will do a loop inside StateSets to activate each StateSet and open NetRender Dialog.