Originally Posted by charlieMOGUL
However, it would be great to have the option to restrict Calibre to only scan certain Nexus 7 (and other Androids ?) folders.
You could always connect to calibre via the Calibre Companion
android app (wifi required). It will allow you to choose or not choose to scan for new books on your device and limits the search to directories where you choose to place your books. This app is well worth the token fee required. I use it with my Nexus 7.