Named NPCs in Sanctuary

You know how all the named NPCs in Sanctuary spend a lot of time "fixing" the house? Which is really annoying since it is not productive and noisy.

I had a couple of the named NPCs in Sanctuary assigned to defense.  I noticed that they spend most of their time "fixing" the house and not on post. Unnamed settlers will stay on post. If someone is assigned to defense and not on post then they're not very useful (not detecting and shooting hostiles). Preston has a particular tendency to just roam around the settlement.  I assigned the named NPCs to things like farming and scrapping station. They don't have to be physically there to accomplish the task. A farmer doesn't actually have to be in the garden to create six units of food, just assigned.

Image from shacknews.com