As usual, OC-Freak is right. Here is the official statement from LiteOn. I had sent the request yesterday, today I received this answer:
Thanks for contacting LiteOn Customer Service.
With the current version of LDW-812S, it is still not possible to change the bitsetting of DVD+R/W.
We're working on a newer version which can support it. It will be released every soon.
LiteOn IT (Europe) B.V.