The Weight in [your unit] field appears because the FedEx module is enabled on your account, and Service Type for Fedex appears because a route tagged FedEx already exists on your account. If you don't ship with FedEx you can leave Weight blank (it's stored as 0) and leave Service Type for Fedex on State Default; ask Sprwt support if you'd like the FedEx module turned off so these fields stop appearing.