its not quite a 'limitation' but kind of an added perk. the lite on engineers pretty much feel they've mastered 2x burning and can burn 2x -r on even pieces of plastic, so they disabled 1x since they think everything can handle at least 2.
Yup, I made the +r switch after my more recent hard drive corruption and had to restore stuff from my G04s (luckily after the bitsetting tool came out). the speed to restore was painfully slow. I tested the bundled ricoh +r with the bitsetting tool, and it allowed + media to be read by my rom drive : at full blown speed. on top of that, I have guaranteed compatibility
(actually, I burned one disc out of a stack of 25 which didn't pick up in my rom drive. The kprobe scan was good, I queried it and got confirmation that it had a -rom booktype, but still, it wouldn't pick up in my rom drive. All the others worked. any ideas guys?)
the +r costs more, but its kinda worth it for the peace of mind with compatibility, and speed.