Although unpopular with many people, Ayn Rand approached philosophy in some ways as you are proposing. She strove to discover general principles that, once grasped, change the way one acts. Personally, reading and understanding her philosophy has changed my life and the decisions I make a great deal. For anyone interested, I have a site http://www.ImportanceOfPhilosophy.com that explains why I think philosophy is so…
One of the ways I (and others) knock Ayn is that she didn't have an effect on later developments in philosophy. But she did have an effect on people's lives. By pg's definition, is she more relevant -- or is she reheated Nietzsche with some Stirner stirred in?
As for Rand's limited influence on subsequent development in philosophy, that's an interesting point. Why is this the case? Even if you disagree with Rand's philosophy, I think it's pretty outrageous that her work isn't even mentioned in more university philosophy programs. There are only a few other philosophers whose work provides as complete a system for understanding reality, the nature of knowledge, and the nature of ethics (I'd include Aristotle, Plato, and Hegel as others that are similarly complete, but there aren't too many after that).
So why is Rand's work not taught more often? I'd say that is mostly the result of the biases and predilections of the typical university philosophy department.