re Q3: Perhaps you could display the number of books as "275 of 3000" or whatever. That shows both the currently available number and the total. Using this idea, with no restrictions the number of books would be "3000"; with a restriction it would be "x of y". Note that it should be perfectly OK for that to be "3000 of 3000" if I choose a 'restriction' that happens to select all books!
Xenophon
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