Rate calculator from to by zip code, make it simple

Rate calculator- In your earlier version it was easy to calculate rates. Now the only option is from a warehouse (pre-defined ship from locations in settings) to a zip code or address. Can you possibly make it so the "from location" could be from address or zip that you can type in. The reason is: there is a need to calculate shipping from a location that will send them a printed paid label, This is not necessarily a return based on a shipped item.