Would this be doable?
Double click on a soil type and have it highlight all similar soil of that type connected to that tile. Then give a zoning button to create a growing zone in the highlighted area. Could be useful for making a rich soil for obvious reasons or a gravel zone for planting potatoes.
Possibly could include an option to perform a plant cutting option on the selected tiles as well.
I don't understand why it's still not in the game. Also, why you can't double click on a wall to have all that walls selected, or double click to select all steel ore squares in view.