Nec 3520 Bitsetting policy

I’ve read many posts about firmware and bitsetting, but my question is:
why NEC don’t support officially bitsetting in original firmware?
There is some particolar reason?
Can I expect that in further fw the bitsetting will be introduced also for DVD+R and DVD+RW, not only DVD+R DL?
Or the only way is the 1.24 version or modified fw also in the future?
Many thanks!

Unfortunately the only real answer to this can be given by NEC.