CO2 Volume and Altitude

I'm new to kegging but I understand that thealtitude effects the volume of CO2 you'll need to force carbonate your beer. For instance, according to the carbonation chart in the Draught Beer Quality Manual from the Brewers Association you need to add 1 psi for every 2,000 feet above sea-level. It would be great if you could enter your location elevation so BeerSmith did this autiomatically rather than having to remembere to add an additional couple PSI if your at 4,000 feet above sea-level.

Thanks and Cheers!