I understand your affinity for books, but players in DF burn whatever they feel like. Magma appears to be the solution to every problem, problem being real or perceived. Goblin explosion? Magma. Too many cats? Magma. All the cats are adopted by dwarves? Burn the dwarves in magma. Dwarf can't find enough silk cloth and goes crazy from his mood? Magma. Dwarf uses all the adamantine to make an earring? Magma. Too many children? Burrow them and flood the room with magma. This is a community that has figured out how drop children into pits with rabid dogs for 10 years until they come out at the end of it legendary in every military skill, provided they don't go insane first.
If children aren't even implemented in a way that won't end up getting them burnt in magma. I assure you, there is no way to implement books without someone deciding to use magma to make it "work" differently.

And this is why I love this game! All I want is for bibliophiles to run the school out of the library, making it (possibly) less desirable to burn the children, or the bibliophiles, in magma. I don't see how we got off on this tangent anyway, exactly.