I have seen a rear light in the new '13 Escape that has a single button on it...looks like it could be a direct replacement for the rear lamp. The problem may be how to get power to it when the front one is off. I'd like to switch mine out, too, but do not want to invest tons of effort in the process.
The stock (Focus) setup is odd. I'd much rather have the rear one be switchable than the front.