Hey! I have lil' suggestion:
Can there be several options: Story, Whatever else like Missions, Challenges and that stuff..., Cutscene Desinger, Level Desinger, and World Desinger.
That last one could work like this:
You place a link or something like that to an image that's going to be the background, the click the button "Create" and then select between "Level", "Cutscene" and "Interactive"* (yeah I just didnt knew how to call it...). Then you click where you want to place it. Then you select it and paste there the code of the level/cutscene. *If its an "Interactive" thing it could be something like an moving enemy (pretty much like in NSMBWii), domething that blocks your path or a shop or some of that stuff...
Put that in a blender with some nice extra options, effects, default images and coding, and we have a nice game!
Well, not nice... an AWESOMELY EPIC one, but the Beta one is already Awesome and Epic, so.. that could make something very good to add!
P.S:
Have you found the bits 1231, 5384 and 89324 of my brains that blew up? CANT FIND THEM!
