When you flash the drive, it is set to "Quiet Mode" by default (without even running the QuietDrive utility). This is the mode I wanted so I never even bothered to run QuietDrive and change it to anything else. And yes, when you put the drive in your Mac, it will remain in that mode.
Kinko's didn't work out for me. It seems that all of the Kinko's in my area had the external USB ports on their PC's blocked. There was no way to plug in an external case. So I ended up flashing the drive using my neighbor's Windows XP machine.
As a side note, I have been following the thread on videohelp.com titled "Pioneer 109 Record Times", and I can confirm I am having similar issues as others. I have a 2002 Quicksilver G4/933 with the Pioneer 109 installed on the internal IDE bus. The firmware of my drive is 1.40 (the latest). With Verbatim 16x media (+R and -R), I am getting burn times of approx 9 minutes with Toast 6.0.9 for a full SL disc at both 16x and 12x speeds (regardless of what the Toast countdown timer shows). However, at 8x I can burn the same image at approx. 6 minutes 50 seconds. I determined the problem to be either the lack of a proper 80-pin IDE cable, and/or the fact that 16x is simply beyond the limit of the optical drive bus in my Mac. This seems to be confirmed by what others are posting, as well as from reports I've read on xlr8yourmac. In any case, it does not seem to be caused by not having the latest firmware (since again, my drive is flashed with 1.40). You can read more about it in this thread, which I started.
I would have posted this information on videohelp.com but I am not yet registered there. Hope this helps.