2. The area it can manage should be larger
3. It should be possible to edit the size afterwards if you are a law speaker.

My reasoning for this is that this is a village managing tool, it should not cut in authority cost as it does nothing for the village defense.
It is a tool for managing access, some areas should be bigger other smaller and as it cost authority it is hard to use them however you like.
They should not be completely permanent, we could just have to tear it down and rebuild it, sure but some quality of life would be appreciated.