This happened to me ONE MONTH after I bought my car new in 2008. Windows and sunroof got left open overnight and it poured overnight. I was devastated when I found the car in the morning.
What I did was immediately soak up the excess water with towels. Lots and lots and lots of towels. I put the car into the garage, opened all the windows doors etc. Aired everything out, put some fans on high blowing air into the car. I then ran it with the heat full blast and sort of repeated the process. Cleaned the interior and conditioned the leather after it was dry.
2 1/2 years later and my interior is fine. No cracks in the leather, no damage as far as I can tell.
The dealer said the remote open feature can't be disabled. I never keep my keys in my pant pockets anymore...