erm well not sure if this is the same thing but:
Seems to indicate the current Pioneers all let you do this, incl DVR-106 with current firmware which I have, with the appropriate media:
EG 1x-2x DATAWRITE (RITEK)
Don't have that media myself though.
I upgraded to 1.06 but then I've got a separate DVD-ROM so I don't see the need to multi-region/flash my burner esp as the ROM was Â£20 vs Â£130 for the burner.
Oh yeah and there is this thread too: