You can use MediaCodeSpeedEdit and B7T9 RPC1 firmware in .cvt from http://dvdpro.club.st/firmware/BENQ_FW.htm to have a region free, rip-lock removed (16x read speeds on all forms of media...) drive which makes it one of the fastest rippers available at that point in time. It supports bitsetting out of the box on +R Single and Dual-Layer media.
This is only if you want to cross-flash it and I have had no problems cross-flashing my BenQ DW1620A.
In MediaCodeSpeedEdit, to remove the rip-lock, just load up the B7T9 RPC1 .cvt file and then on the right-hand side where it says, "Read speed settings" put a check in "increase read speed". Then from there go to File | Save Firmware and save it out with a different file name. Then use WinDWFlash also found at the website listed above and use that to flash the drive with the new .cvt file. Good luck, if you decide to go this route, and have fun with your new drive. If you upgrade to G7T9 it does not do very well at disc quality scanning but in terms of burning it seems to be equal to B7T9.