Actually I have a related question. The User Defined device plugin only defines a few parameters.

Do these completely define the device interface? IOW - is every device interface plugin just a set of these parameters? The nook app for android is diffrent from the native nook app on the nook color, so I need to define the directory. I can do it via 'connect to folder' as well as via the User Defined device plugin.
Secondly, where does calibre look for cover photos? After I load a book, and check the device view, I do see the metadata, but not the cover. Does calibre load the cover separately, or is it embedded in the .epub? I believe the latter, and the reader app then pulls it ou and stores it some place where *IT* likes it. Can I tell calibre where that is so the device view shows the covers?
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Regards,
Rich