I got a second-hand Pioneer DVR-K17A (a slim burner with IDE interface for my laptop) and I managed to dump the firmware in order to edit it.
I would like to increase the number of writable sectors in a DVD-5 by editing the hexadecimal code. In this way I would enable the overburning feature.
Using an hex editor, I even saw some interesting strings that could be suitable for being modified, but I need someone who perfectly knows this stuff.
I know this is just a minor tweak and I really like experimenting, since the burner's value is very low.
I could even upload the firmware file, if someone was interested.
So if someone has useful suggestions, please reply to this message.