Change the default quote rate in the calculator to residential

It would be good if the calculator tool ( which is in an API the tool that quotes an order in third part sales software's ) could change the default commercial quote rates to residential, i know that you can change it manually for every single time you want to quote, but when you receive thousands of orders a month this makes a company like ours get hit by a loss of almost 40 thousand dollars just in the month of December. Because the commercial rate is anywhere from $1.00 to $4.00 less than the residential. So please make this functionality available so business like ours do not have this kind of experience. I know that you can change it manually but is everytime , and you cant do it if it is via an API. thanks