Ok, I get it, I make horrible suggestions, now you're probably wondering what stupid suggestion i'm thinking of NOW? If this exists, HOW DO YOU DO IT!?
So when you set a farm flag in your lot, no one but you is allowed to shear or kill animals.... Well, what if we give the permission to?
The command?:
/allow shears <name>
/allow killing <name>
You can unallow:
/unallow shears <name>
/unallow killing <name>
So what do you think...?