@Patrick Derwael - you can run the calibre-spy plugin on multiple clients against multiple server-hosted libraries. There's a catch22 - its a read-only solution, but it seems that you want fine-grained selective write capability.
BTW : your dismissive attitude towards suggestions given in good faith is unlikely to win friends and influence people, some might be tempted to add you to their ignore list. If you're as smart as you're projecting yourself as being - start coding. As Kovid Goyal is wont to say: "Patches are welcome."
BR
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