Absolutely. That's how I do the bulk of my news posts; I just save the stats I want as a complete webpage, then load that into Excel, muck about with it as necessary and rinse and repeat for any other stats you want to include.
As for the overtake stats, BOINCStats uses its own RAC (BS-RAC) to do calculations. This BS-RAC differs from the official RAC, sometimes significantly, so you're better off using the official RAC data if you want to perform stomp calculations.