To this specific idea, I would say no. Only because the way the game settings are set though We couldn't make that a world specific thing. It would be a game changing setting that would happen across all worlds.
BUT, I've actually been working on an event idea with the underlying points you suggested. Bigger armies, bigger wars, quicker building. Instead though, I used the idea of Havoc for this event. Havoc is usually fun for newbies because it's easy to build and they can explore more of the game's functionality without the experienced players coming and knocking them out before they even start.
Keep an eye out for the topic when it comes out