What I would like to see is not a "monster book" but a "monster construction book". More than just a "one from column A, two from column B" approach, it would analyze how creatures fit into an ecology, or unique monsters fit into a narrative. It would then give tips on how to balance a creature against the the PCs. From what I hear A Magical Society: Beast Builder takes this approach for d20, but in the BRP we have to guess how characteristics and special attacks affect the deadliness of a creature.
Such a book could have wide applicability. Fantasy GMs could create whole new encounters to surprise their players. Science fiction GMs could create plausible alien flora and fauna. Horror GMs could move beyond standard Cthulhoid monstrosities to create their own terrors.
Then again, in games as in real life, I believe the deadliest creature is man, so I think a GM can do pretty well by pitting human(oid) societies, kingdoms, and organizations against the PCs.
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