Reinforcing troops

What about a button that allows a player to produce the max amount of of remaining units from a town so a button beside infantry to max produce infantry from that town alone, Reason i say this is the auto produce button you will only get that type of unit at the start of your turn and some towns are beside a river or ocean where you would only want one ship or one battle ship so you cant put that town to auto producing any unit unless you really like having alot of transports or something else thats useless in the long run.
I think i saw this around somewhere else but i could be wrong and i dont want to read through all the ideas people have had.