Well let me clear things up a little , you are able to write at 2 speed on your Pioneer A04 with Nashua 2 speed discs after you installed the 2x 4all firmware.
But don't even bother because movies tend to be malfuctioning due to the Nashua DVD-R's (just tested this with The Mummy , I ripped the movie like always with DVD Decrypter used DVD2One and burned it with nero Burning Rom 22.214.171.124 @ 2x speed onto a ViVastar DVD-RW. Which plays fine without any hanging or so.
The I thought why not burn it onto a Nashua DVD-R they are much cheaper , and I did so but now the movie keeps hanging on and on with still about 10 minutes to go.
Ithought it was a Nero compatinility problem and burned it with CopyToDVD. But the movie still keeps hanging now at a totallly different time.
So you see the media (Nashua 2 speed DVD-R's) are somewhat faulty , and I'm currently looking for a good alternative.