How about being able to choose where things will get stored? With bigger cities, several storehouses are a must, but right now this means that a stonemason might have to cross half the map just to get one raw block of stone. If one could allocate the storeroom close by to gather stone he wouldn't need to wander so much around.
Also, while we're at it, hauler as an additional profession to move things around. Not much needed early on, but the bigger the city, the more useful they would get. And of course even more so with the specialized storerooms mentioned above.