Regarding the posts at the top of the page about the tank physics, one of the upcoming patches (IDK if it's the next one) will update the engine with proper physics for the tanks, so you'll be able to jump them and roll them, and fall off cliffs.
There's a video on Youtube somewhere (I can't get youtube at work so can't get the URL - just search 'World Of Tanks Physics'). They look a little 'floaty' but that's apparently because gravity is at half strength for that video to emphasise the effect.