Is there bitsetting hacked SL +R FW for NEC 6500?

Any NEC 6500 FW supports bitsetting for SL +R out there?

We already had a newspost about this. But the settings cannot be changed. There’s a default booktype DVD-ROM for DVD+R discs.

The firmware is excellent. Not sure why anyone would need to bitset to DVD+R over DVD-ROM anyway.