Have a 1004IM with firmware 49b1, which works pretty well for me (I can read DVD+RWs written with firmware 47/48, which some others have said they have problems with, for instance).
Bitsetting for DVD+RW works as well - I've only tried to do it after a burn with Nero, but what I do is start the bitset tool, change the book type from DVD+RW to DVD-ROM, set, and eject - upon eject, I can see the drive light blink orange for write (when the bit is being changed), and then green to eject.
However, when I try the same procedure with a DVD+R (prior to burn with Nero), it doesn't seem to work. I insert the disk, am told there is no current book type (which I assume is normal), set it to DVD-ROM and eject, and no orange light or write...just the green light right before eject. Since I've had to do this eject to "force" the set for DVD+RW, I assumed I'd have to for DVD+R as well, but no joy. Once I reinsert the disc, I'm told there is no book type set again.
What is the correct procedure for setting the DVD+R book type to DVD-ROM?