Mr Pheer

There is a reason that the B2 is fly-by-wire and all virtually all past & current aircraft, especially fighters and aerobatic planes, have vertical stabilizers and rudders.

There are very few exceptions, and those do not do a very good job of yaw control at lower airspeeds, such as when landing. And that's really important in a crosswind.

<-- Former air traffic controller, private pilot, and RC pilot for nearly 30 years

And then there is this...
http://en.wikipedia.org/wiki/Flying_wing

Scroll down to 'design issues'

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