The next release will support setting a restriction (the same as restrictions in the GUI) for an instance of a content server. This, along with mshellberg's idea, will give much of what is desired. One logs into an instance on a port, and see only the books that the restriction permits. In other words, the port used defines the group, and the restriction defines what is visible to that group.
There is no reason that multiple content server instances cannot access the same library.
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