Since it's possible to choose the type of material used at the metalsmiths forge, why not at the other workshops as well? It would be a great boon to the micromanagers out there, (we all know who we are) to personalize each dwarves bedrooms with blocked walls and furniture goodies out of the materials they like. As it stands currently, you have to eliminate all intake of the raws of the task you want to perform to prevent a new material of the wrong type becoming available to your dwarven laborer, mark all materials except the single one you wish used with forbids (which can be a real pain in the rump, if your bookkeeper isn't quite up to snuff yet and you have to hunt through rediculous z-layers of area to track them all down), or, slate a storage room full of them to be made, and hope that you get one or more of the one you need by sheer chance. Or do the single specific storeroom for every single base material related to the craft, and do the restrict to burrow method with your crafter, but again, it's just crazy.
Please, for the sake of all your OCD players, at least give the idea a once over
And, as always, awesome, enveloping game. I've waited for something like this for ages! Keep up the good work!
P.S. On a side note, another small additional feature along the same lines would be nice. If your bookeeper is high enough to have accurate counts on all your current materials, is there any chance that instead of having to skim the stocks screen before each build setup, if instead you could have it list when choosing the item construction in the workship the number of tries you have the materials for? Just wondering