Here's what I came up with as a workaround to the shelf deletion:
1) When I want to create a new shelf, the first assignment is from a B&N "purchased" book.
2) If I don't have an already purchased book, then I will "buy" a new one. What I do for these, is only buy a free book on that topic. So far, I've been able to find free relevant ones.
3) Then all other books, both purchased and sideloaded, can be assigned.
After this process, shelves are not deleted. On the other devices without sideloads, it will only show the "purchased" books, and on the Nook it will show both "purchased" and sideloaded.
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