Could anyone make a plugin where if you throw a tool or armor in the furnace and you put the corresponding material as fuel it smelts and repairs your tools/armor.. for example if you put a almost busted pickaxe into a furnace with a diamond as fuel it will repair the pickaxe based on a configurable amount of time.
I'm actually doing one right now, but it uses iConomy, you should check out Cookbook, I think it has repairing.