Sorry. That was a bit curt.
The fact is that there's already a lot of drag and drop stuff going on in Book Browser to allow the reordering of the spine material. And drag and drop is explicitly disabled on most of the other folders in Book View's treeview (so that people can't try to move images into text resource locations, and vice-versa). So in short... the internal drag & drop features/logic we're supporting within Book View will pretty much preclude the ability to be able to drop external resources onto the tree AND be able to sort out the intentions of the user's action in doing so.
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