I was unhappy with the RoadRunner DNS redirect "service" they installed in Rochester a few weeks ago. It turns out they did incorporate a facility to disable it:
It didn't ask me for my account login/password so I assume it's doing its magic using just your IP address. It said it could take up to 5 minutes for your preferences to take effect, but for me it was immediate.
The roadrunner "search" page to which they redirect you is pretty useless. Now I'm back to having bad or partial URLs redirect to Google (as my browser is configured to do), and I'm happier.