Is there any way to mod armor damage?

[Alneyan]

You cannot add damage types with the current game engine, and I don't think you could have a workaround for this. The "Double Damage to shields" only apply to the shielding around the ship, and not to the component itself, so adding a dummy shield ability will not work here.

The only ability anywhere close to this would be "Skip Armour", which allows the weapon to bypass the Organic/Crystalline armour special effects and the armour ability of "Is destroyed first".