Yes, it's a simple addition to the Platform behavior. An action to set the "doubleJumped" boolean manually. Modifying an official behavior is pointless, and creating a new one with additional functionalities isn't much better. Your best bet is hoping for Ashley to take notice of this thread and apply the modification "officially".
Meanwhile, you could encapsulate your "Reset double jump" routine in a function, and use this function inside your code. It will make refactoring easier when (if?) the time comes.