Correct, you just build them and they make food, I completely ran out my budget in features so I couldn't make farms seasonal or deplete. You can toggle off the building tool by pressing '0'. Due to the size constraint, the repair tool is also the destroy tool- so it only works on fully repaired buildings, but repairs cost nothing so it just works. I wanted to do the drag tool as well, but I just ran out of space on it. Most of the size comes from working on pathfinding logic, nothing is more annoying than villagers getting stuck for no reason.