Title: TO preventing food sale
Summary: I'd like to see features such as being able to put food on the market disabled during a TO. It makes little sense to be able to put your food on the market when enemies should be guarding everything you own in your region.
I can see this working in two ways.
Either if your region is being taken over, you lose the ability to access the market place or a simple error message saying you cannot buy or sell due to your region being under a TO when you try to buy or sell food.
Benefits: TO has more impact.
Possible Downsides or Exploits: Can run multiple TOs to stop several regions from selling or buying food.