The burner's firmware must support bitsetting so it depends on what writer you have if and how you can do it. DVD writers from for example BenQ, HP, Lite-On, Ricoh and others support bitsetting while for example DVD writers from Optorite, Pioneer and Sony don't support bitsetting.
If you are going to buy a DVD+R DL writer be sure to get one that supports bitsetting as compatibility for +R DL without bitsetting is just about 40-60% while with bitsetting it's more like 80-90% (based on the early tests I've seen).