Toady, you mentioned that you had an abundance of bone materials in cities that builds up making the number of bone crafts unreasonable. I think one problem with this viewpoint is that in the real world bone material often has many more uses than are present in the game and in large industry and small industry alike the bones get used for all sorts of things. For instance, there is a small amount of bone ash present in many pet food brands (for cats and dogs) even though the higher quality companies try to limit that amount for health reasons. Many early cultures used bones for needles or knitting needles (Dwarf Fortress lacks knitting, btw). Also, bones were often used as jewelry, something that already occurs in the game. I think if you wanted to increase the usability of bones and thereby decrease their build-up in city stockpiles you would need to make the market for bone larger by increasing the demand for bone crafts or bone decoration, or other uses such as bone meal for fertilizer. I think this would be much more realistic than trying to limit the production and accumulation of bone. If you don't want the stores to be full of the stuff, why not make it more prevalent as something that is actually more useful for the townspeople?