It really isn't that complicated. Nobody is claiming that there is a paint-by-numbers approach to writing the Novel of the Century. Even if you had such a technique, people would still screw it up. Nothing, not even "emotions," automatically makes a piece of fiction good. Nothing comes for free, ever. Packing in the emotions is no more likely to make your writing good than packing in the rationality. The best you can do is inspire people to write and experiment, so that some good stuff is written along with some bad stuff, because that's just how it goes. Especially at the level of decent fanfic like HPMOR, it would be nice to see fewer instances of deus ex machina and naked wish-fulfillment fantasies.