Default all addresses to residential

On Settings => Shipping Profile page, there is a Global Shipping Options section. Click on the sprocket found on the right of +Add One ( Additional Shipping Profile)
You can select "Default all addresses for Residential"

There are a few usages for this setup, one such example is for the FedEx label.
When ActionShip sends an order to FedEx to request a label, we need to specify if it is shipping to a residential or commercial address. We will use your setup on this to decide the address type of your order.

FedEx will validate the address again and decide the correct type (residential or commercial).