Well we’ve wondered if the version 6 chipset could do it and indeed it can.
My Memorex 48Maxx (which I had flashed to a Lite-On LTR-48246S) is now a 52Maxx (52/24/52) with firmware 6WS2. Nero reports 7,800 maximum speed and tests have shown about a 14-15 second jump in writing an 80 minute disc.
No problems so far.
Can someone please post real Lite-On 52x firmware (I would rather use Lite-On since they upgrade their firmware frequently).