League Map Editor. How Feasible?

Starcraft has map editors. And when people connect to a custom map, it automatically downloads it to their local machine. How feasible would it be for Riot to implement a map editor in League? No IP awarded for games played on such maps, of course (I imagine an IP farm would be created within SECONDS of a map editor being added to the game). I'm thinking of custom games like Hide and Seek and Ultimate Bravery.

I would actually love some feedback from Riot software engineers and technicians on this...