LIGHTNING UK!,
Thanks you for your quick answer, yes you are right it seems like it is a mess. I have tried with several Bitsetting/Booktype tools but they all say that the drive does not support bitsetting (or the tool doesn't support the drive).
However there are 2 burning programs that accept Booktype changes...Nero and ImgBurner...however as mentioned only Nero actually works but if my memory don't fail me it used to work in IB to.
I'm happy for all the help I could get in this matter since Nero doesn't support DL in the same excellent way as IB does and for CloneDVD DL images Nero is no option AFAIK.
[EDIT]
I can now confirm that it works in the older FW rev U06 even with IB!