To sum it up quickly, bitsetting allows a burned DVD to be seen as a DVD-ROM, instead of a
DVD+R(W). This supposedly enhances compatibility greatly with stand alone DVD players. This is of course a simplified explanation. To find out more detail, try the forums at:
Here
and
Here
and do a search. They talk about it extensively for various different model burners. It is my understanding that it is available for most single format DVD+R/W drives (with firmware updates) and only a few dual format models (NEC 1300A, some Liteon possibly, so far, again after firmware updates).
It is my understanding that bitsetting is only applicable to DVD+RW format drives, as DVD-R/W burners hardcode the bit in question, whereas it can be set in DVD+R/W burners. Someone supposedly came up with a workaround/hack for DVD-R, but the prevailing question from many was "Why bother?", as most players recognize DVD-R/W already. Again, reading one of the full discussions would probably shed more light on this as my knowledge is woefully incomplete.