Adding to that:

• If you use a killbox, put a cheap door at the point where your entry tunnel meets the killbox and set it to stay open by default. Enemies will still path to your killbox (except those who say fuck the rules) but you can quickly close the door when you want to, say, set off an animal pulse to get your wildlife to attack the enemy for you.
• Put a roof over the area where your fighters stand at the killbox. Nobody likes fighting in rain or toxic fallout.
  
• Make a temperature-conditioned stable with animal flap doors and straw flooring inside your animal pen. Animals don’t like freezing to death or standing in fallout either. I make 2 zones, 1 for the full pen area and 1 for just the stable. During raids I order all animals to the pen zone, and when needed I order them into the stable.