Hey Franck (and the others reading this):
Did you (or anyone else reading this) ever get the chance to find out whether the problem with WOPC working in a non-standard way with CMC MAG E01 also applies to firmware version BCFC of the BenQ DW1650? You were pretty clear about it affecting BCHC and BCIC, and about it not affecting BCDC, but BCFC seems to have been left in limbo. Because the firmware wasn't as widely released, it seems that fewer folks bothered to test it and play with it, to see if it was a happy medium between BCDC and BCIC.
Also, one other question. I noticed in reading about and experimenting with SolidBurn that it can act kind of quirky if you don't clear your EEPROM when switching between it's various modes of operation. When you discovered the bug with WOPC and later firmwares, did you always clear your EEPROM after turning SolidBurn off for known media such as CMC MAG E01? In other words, did you not just turn off SolidBurn, but leave the entries it had created intact, but did you turn it off, and then do a clear, before your WOPC tests?