Renamed this page, so it fits better into my needs. During refactoring the code I streamlinded the export procedure. Its more clear now and it seem to work again.
I finally managed to export particles correctly, they now create velocity based motionblur. Images will follow. Additionally I implemented the particleSamplerInfo shading node, so that you can use e.g. opacityPP or incandecensePP for shading.
I'm still waiting for a response from the 3delight people if thy will allow me to use parts of their code. Well, if not I have to rebuild some parts by myself. But meanwhile I have a bit more experience in shader coding, so that I am sure I could manage it, even if it would take some time.