Rear View Mirror issues on Edge

Your @twitter rep recommended I write my feedback/suggestion here. I have a new (less than 200 miles) 2011 Ford Edge. When test driving, you do this during the day. It would never dawn on me there would be issues with the rear view mirror. Driving at night my rear-view mirror goes on an "auto" dim setting that I cannot turn off or adjust. I don't like this feature and the lack of flexibility with it. I cannot see cars behind me well in the rearview mirror at night. I was told this cannot be turned off or adjusted. This I find VERY disappointing with my new car. I think drivers/owners should have an option with this. Yikes. I suggest the engineers make this an optional situation for drivers in the future.