i was thinking a smith ability that would be useful would be deconstruction. i mean when a smith comes across an iron sword or diamond armor other than a chestplate he could repair and sell it or he could deconstruct it and get the materials back that went into making it or some of them then make other things with it like break down iron swords and make himself armor or break down diamond swords and make himself diamond picks any way just an idea to look at 


and r3xz thats a good idea not geting all the material back say small things like a diamond sword or shovel u would get back 100% but a thing such as a diamond chestplate which is 8 diamonds u could get like 5 or 6 diamonds back maybe??
If Smiths can already repair items, then I think they should spend the gravel and repair the item before dismantling it.