More ideas for you:
Storage, this is a limitation so people cant just mass-farm everything early game, you would have to build an area for storage, such as a barn, or have containers for it.
Farmer's Union, if a farmer has an extremely beautiful farm, and has skill building, they will be offered to join the Union, where you unlock a lot next to the lots of other Union members, this will get rid of people who have amazing farms (I'm looking at you Conan), and have to see stuffty dirt piles with weed everywhere, which bring me to the next thing about the Union... You can not grow weed at all, if you do, you would probably be kicked out of the union.
Sla- I mean Workers, Basically bot placements, and to place one, you have to "hire" a bot, which is just buying a permit to hire people, and then buy the worker at a certain place, you can only have workers if you are in the Union (To prevent bots lagging the entire server)