The stockpiles plugin currently can't handle generated materials and items well. We should be able to toggle and export settings for butcherable, brewable, instrument, etc., traits.
It may be worth adding a button to toggle all generated creature (i.e., FB) materials for a category. Particularly for corpse parts, since those are not shown in the list, instead controlled by enabling/disabling the entire category. (Fat and tallow materials are visible, by contrast.)