Enable the deactivation of experiments

Some enabled experiments have disabled mob spawning in things like Creeper farms. 

Once enabled in a world, experiments cant be disabled once enabled. 

If for some reason long ago (when you still could disable them) you deleted the original world and only had the copy left and thats what you have been working on for the last 5 years. Now you cant disable it and its killed a lot of your spawn farms. 

So bring back the ability to turn these off or give us a method of generating a new world from the one you have but without the experiments turned on. 

Give us a way to create a clean copy of a world that you only have a copy of with the experiment enabled.