Yeah, that's what I did. I use my power meter for watts and cadence on my trainer road setup, but still keep my head unit on so that I can track distance/speed. I know distance/speed is not important to trainer riding, but I still like to log in the miles on my workout log account.
What I do: http://app.strava.com/athletes/345699
What I do: http://app.strava.com/athletes/345699