Kovid, a thought..
Have you ever considered expanding the content server functionallity of calibre to achieve similar results?
Basically, from within calibre have some way of telling calibre to look at a remote calibre library and allowing the user to import/download books directly into the local library. Doing it this way would eliminate any complications arising from two instances of calibre sharing the same library...
Just an idea, have no idea whether it is doable or not, or whether you would be interested in implementing such a feature.
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