You are still not understanding the fundamental request here. Obviously you can't stop users from re-sizing applications in the desktop interface.
What I want to disable is the "docking" ability. The screenshot below shows how you can "dock" the desktop as if it is a single application. If you never use metro apps, this ability does not provide any value. You will never want to "dock" the desktop to split the screen with a metro app if you never use metro apps. This functionality is simply an annoyance.
Can this "docking" or "split screen functionality" be disabled?