Evolution on a grand scale is gonna be pretty hard to implement (and possibly not a good idea in a fantasy genre game). However, I think small scale natural selection might work. If you give each sentient creature "genes" determining some things (strength, natural armour resistance, aptitude with certain weapons) then the ones with good genes may end up with more children, and thus you may end up with creatures that gradually become better. Or something.
If I've been reading correctly, the things required for natural selection [said genes, said genes getting passed on to offspring] are in the game, so, limited evolution / breeding is fully there. (See all eugenics posts related to this release-ALSO KNOWN AS "artificial selection".) Won't have enough mutation or variation to really get things moving though...
I think it's just about how Toady sees dwarves. From what I gather poison is more against what Toady's idea of typical dwarven ethics are.
If we can't have a dwarven Grand Vizier/High Priest who'll slip the poison in the cup of the King while the diplomats who MIGHT use poison are here, then it'll need more work.
That is, personal variation of ethics ...feel like I need another pluralisation on there.
Actually, can see the whole gene system being used for the ethics as well...though they would be altered/passed on a bit differently
Lead is poisonous, but you would need rather a lot of it to induce a quick fatality.
Perhaps mounted on the end of a long haft.
in re: pierce-type v maille: I have heard that, to an archer, a maille-shirt is "a lot of connected holes" or so. Another thought is that, to a small impact, it might actually DECREASE the contact area, and make the metal more likely to give. But I don't know.
Whew, caught up on FotF. And yes, that style of DMing is nice- though, (hp rant cut for time)
edit: Thought of some questions.
Is it possible to hack something off by parts, e.g. You hack at the Tree with your ☼Steel Battle Axe☼x15, the Tree is Felled? Alternately, having three arrows (broadheads assumed) strike precisely and end up severing an arm at the shoulder?
Related but separate, would a Stone Colossus (or similar) shatter (or appropriate) due to brittleness on proper strike from pick or hammer?
(Chisels were the original thought, though unlikely that one can apply properly in battle)