SS discovers the address type through verification. But if verification doesnt work (international or brand new domestic location for instance) then Fedex shipping will default to commercial. This causes problems because ISR is not a valid signature option for commercial delivery. Also residential delivery uses the Fedex Home service not Fedex Ground. These services have different rates, schedules, and delivery options. If you create a shipment on fedex.com there is a checkbox there to allow you to declare the address as residential. SS needs the same capability.