Please, not again. I have to give Plextor marketing credit for creating the myth, but it's false. I'm not going to say it's typical Plextor [BenQ is just as guilty on a couple of other counts], but it's certainly snake oil.
It's time for some high-school [or middle-school, depending on which country you're from] level physics.
We are talking about scattered single-digit milliWatts of reflected light applied over an area of many square inches, compared to 20-30 milliWatts applied by the main beam to a spot well under a square micron in size. That's so many, many orders of magnitude of difference in power per area that it's ridiculous to even consider the influence of the absorption rate of surrounding materials.
The color of the tray is no more important to the DVD burning process than the color of the room walls is to burning paper by using a magnifying glass (loupe) to concentrate sunlight in one tiny spot.
Yes, it does. You can see it in QSuite. If the tabs are not showing properly to be clicked on, use Ctrl-Tab to switch between them.