Show land cut and fill balance on Mine Control Tower

When terraforming an area I like to minimize the amount of material moved away or brought onto the site, and thus save on time and fuel. With that goal in mind it'd be very handy if the mine control tower displayed the total amount of material to be mined and to be deposited in it's area of control so players can check if it is more or less balanced.
Alternatively a tool where I could click and drag an area and have the cut/fill totals displayed while dragging would be great.