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The more I think more about the idea, the less I like it ...
In fact the distinction between "crush" "slash" and "pierce" damage is quite artificial, weapons apply kinetic forces on a more or less large area, that's all ! Additionnaly it's not very applicable to weapons such as giant's swords, animal bites, elemental damage (unless you add resistance to elements as specific armor values), etc...The concept does not work well either to simulate shield defense.

Overall I prefer the way Dom manages it now, with some weapons/damage types being "armor piercing" or "armor negating", others having bonuses against shields (flails), but with a single damage value, and armor having a single protection values with armor pieces just adding to one another.