Yeah that is what I immediately thought, that you would want to do some processing on the changes before presenting it to the users, and not make it live, just asking them to make a change and asking others to rate the change.

That would be a system that you would need a large number of users to manipulate.

The downside of this idea is that their website is clearly about an interactive experience where you move things around and get the feel of others doing the same thing, I dont know if that kind of thing would be compatible with y/our idea without a lot of tricks.