I would be very careful turning off the K-Band detection on your V1. At some point you've got to decide what's more important to you. The minor inconvenience of some beeping, or being protected from older K-Band radar that some departments are still using. My V1 saved me from a K-Band ticket just a few weeks ago.
I would NOT get too comfortable with the idea that K-Band is not being used anymore. I have encountered the exact opposite several times. But that's just my experience.