Originally Posted by kdittyr
That's a good question, though I believe the answer is no (please correct me if I am wrong as I would love this functionality as well). It is my understanding that you have to go through ADE as that is what actually requests the temporary license for the book and then puts it on the nook.
As far as I know this is indeed correct.
ADE is needed for lending the book and setting the expiry date.
So you can drag and drop regular Adobe DRM books (after authorizing your reader once using ADE), but for library books you will always need to use ADE.