There are two sides to every story...some say the cords will overheat, others say it won't. I have an EMS which I plug into the pedestal then my shore line gets plugged into the EMS, so it's always stretched out, not coiled up. I always wrap a chain with a lock around the pedestal so the EMS won't walk away, but I'm probably being a little too protective, or anal.
To remedy the situation, I was going to cut the shore line at about three feet from the junction box in the compartment, install a male 30A plug on the end, then put a 30A female on the open end of the long cord. This way I can accomplish two things...keep the cord coiled properly in an adjacent compartment when I don't need it and then only insert a foot or two of the cord into the rat hole instead of all 25 feet, AND I could keep the EMS connected inside the locked electrical compartment without fearing that it will walk away. Unfortunately, it will make it more difficult to check on the status of the EMS since it would be inside a locked compartment.
But with all good things, I still have this on my to-do list for another day.