Allow players to specialize in a specific crafting discipline.
Gun Smith
Sword Smith
Bomb Smith
Armor Smith
Specializing in a specific craft discipline would yield lower crafting cost, cheaper vendor prices, and increase chance of crafting a UV item.
But i don't think it should be mandatory, and I think(To balance it out)it should INCREASE costs for other things.
For example: If you chose your specialty as a swordsmith, costs for Guns and Bombs would stay the same, but costs for armor, Shields, and Helms would slightly increase.