You can scratch #3 off your wish list!
Oh wow! If you scan the Enhanced-relevant documentation, I can add it to the Option Board archive on ftp.oldskool.org.
That's awesome! I'd love to stumble across one of those.
Trixter,
Sadly, there is nothing new in the manual that is not already out there. Namely, there is a chapter on the theory and use of the EOB. There is actually a good/clear scanned copy here.