In reading through hundreds of NTSB reports I am astonished at the number of fatal accidents that were due to fuel mismanagement at the fuel tank selector valve. In aviation there are so many ways to kill oneself (and others), so many gotchyas, so many things that have to be remembered; so many things to be overlooked or skipped as a result of common distractions. As the self-proclaimed safety nut of this forum, I'm always looking for ways to reduce or eliminate these risks. Can someone please tell me why it is so important that we have such a valve that would limit our access to useable life-giving fuel. What is the need for the fuel selector valve? What alternative is there that will not act in any way as a fuel supply shutoff to the engine?