Well for enbeffect.fx it works really nicely since it has just a single pass... for the multi pass ones it becomes a bit more tricky since there you cant "outsource" everything.
But yeah I like the idea of building blocks for shaders... already have a nice amount of them... I have considered converting other peoples work into that format as well... but time constraint and general "fun" factor has thus far prevented me from doing it.
But I do not mind helping out with it if it suddenly becomes a joint effort.
I guess we should also offer a more clean default .fx file selection so people do not have to start to go about and remove all of Boris´s default stuff. Most of it is not really needed at all, and only serves as very basic examples.