I don't know whether this has already been sugested or not, but the possibilty of being able to mod the game would be awsome, with 4A permission obviously, and if the engine would allow it.
That would be SWEET. But they'll have to release an SDK to make it possible, which I think they won't Maybe we should make our own metro experience using the freeware Cry Engine 3
This is for forum concerns and suggestions not the actual game . But I think that was answered by Joe in the "Ask the Devs a question thread" in the LL sub section.