You might want to simply call it stereo PCM, since "2.0" is generally used for Dolby Digital and/or DTS.
"Not sure why, but nobody seems to have collected all the extras into one set."
Depends on what you mean by "all". I just recently got some deleted footage from someone else, including a 2-second scene of 3PO pulling the warning from the door of a room containing wampas in ESB. I love that bit!
What "extras" were you looking for?