For anyone who might be reading this thread, it turns out that the more recent VRay v3.0 beta builds ~March 2014 onwards, added an additional parameter to the “vrayTransfromFilename” function, which Deadline utilises to make the filename transforms work. This is now all fixed and available in Deadline v6.2 beta 7, which will be available sometime w/c 14th April 2014 onwards.