Shipping Method - Where can I setup the SHIP_METHOD_CODE?

When setting method, I enter carrier, carrier short name, scac code etc in the carrier region and then set up shipping methods by service level and mode of transportions, and shipping method meaning.

However, I dont see a place to modify the value of the SHIP_METHOD_CODE which goes in as something like 0001_fedex_ltl_standard or something like that.

Is there a way to modify the actual code so that it is a a more user-friendly list?

Thanks.

Nat.