For fences I would consider it reasonable if you have like 20 agi that you could jump it. Just right click and hit jump, you walk up to the fence and go to the other side. Additionally, fences should haves gates (especially needed when we get herding) they require no key. Both fence jumping and gate opening create trespassing clues when used on claimed property.
Also, it'd be cool if wild animals (deer, boars, and so on) would randomly eat some of the crops, so you need to have fences around farms to keep them from doing so.
