So I was about to fall asleep, and then I got an idea, maybe to make the game a little funner when you're waiting, you can organize your warehouses.
think of it like this, when entering a warehouse you see a grid, organize tanks, vehicles ETC in this grid to fit as much as possible, along with ammo, fuel, and food.
Each armament you produce comes on a truck and requires you to offload it (basically drag the armament to whatever spot you'd like it in your warehouse, Same goes for food, ammo, and fuel produced by your supply factory)
with a added build slot for cities, the warehouse can hold more based on its level each upgrade gives a nice amount of space.
it would be something to do, while you're waiting for units to do whatever