I do like the combining system in Dragon's Dogma it's something that could benefit the next mainline Zelda in allowing some items be crafted with out needing cooking facilities near by. Another possible idea to play around with stems from the earlier suggested blacksmith feature where on top of adding the possibility of repairing gear using resources you find a feature maybe added after doing quests and such where you can either enhance weapons or create better ones similar to the Alchemy Pot feature in the DQ series.