Here are the Benq releated changes of MediaCodeSpeedEdit V1.0.8.9:

Code:
Changelog
1.0.8.9 18 May 2006
Additional support for Benq Panax chipset drives:
- added support for BENQ DVD DC DW1670
- added support for SONY DVD RW DRU-820A 1.0b (Benq DW1670 clone)
- added support for ATAPI DVD DC 16X8X5 (Benq DW1670 OEM)
- added crossflash option for DW1670 firmwares
- added support for BENQ DVD DC DQ60 (TEAC 516E clone)
- added support for PLEXTOR DVDR PX-750A (TEAC 516E clone)
- added disabling of write speeds, which enables 12x PCAV
write strategies when disabling 16x write
- added display of 12x write speed if 16x is available for
easier 12 write speed support after disabling 16x
Thanks to DMagic1, ghetocowboy, yanxi and zevia for the tests.
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http://ala42.cdfreaks.com/MCSE/MediaCodeSpeedEdit.zip

http://ala42.cdfreaks.com/MCSE/changelog.txt