It appears it may not be capable of permanently setting the Booktype but on a disk by disk basis using CD-DVD speed I am able to change a DVD+R to a DVD-ROM assuming the blank is inserted in the drive. Once that disk is ejected the drive reverts back to +R so have to use CD-DVD speed again with the next disk.
That is why I wondered why the option in DVDFAB to change the booktype to DVD-ROM does not seem to do so when I burn a disk? If CD-DVD speed can do it it would seem that DVDFAB should also be able to using, I wiuld assume, much the same technique as CD-DVD speed. Otherwise, why have this setting in DVDFAB?