The booktype setting is a feature widely supported by almost all recent drives, as it enables the change of the booktype on specific media (DVD+R,+RW,+RDL to DVD-ROM), so as to achieve maximum compatibility with stand alone players (mostly outdated ones). This can be done prior to burning the inserted media or during the burn process (at the beginning with Nero or another burning software).

Well, as it happened with the Pioneer DVR-111DBK fw.1.06, so too here, the booktype cannot be changed, even with the new firmware and is by default set to DVD-ROM, but only for DVD+R DL media.