I was just checking out the market and found this awesome application.
DockRunner allows for your phone to go INTO the multimedia dock mode without the phone actually being in the dock. You probably just need to make a stand for the phone to sit in yourself, but that isn't too hard.
I just wish the charging port was on the other side. I will update this post when I can find the app on Androlib, but its definitely in the market.
Search for DockRunner.