Default all address to residential
On Setup->Shipping Profile page, there is a Global Shipping Options section.
You can select "Default all address for Residential"
There are a few usages for this setup, one such example is for the FedEx label.
When Teapplix 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).