Might. It's on the slope of diminishing returns, though. (And the numbers of different ways to get variables out of the arg array is huge.)

Parent classes and dependencies are machine-document able, fairly easily. They are conceptually similar. And documenting them for a human is usually copy-paste-format in my experience. Trying to automatically document functions may be useful, but it wouldn't be something I'd want to run with the dependency tree. (Which I would want to run on every module I've ever written: It'd make my life simpler.) Functions I'd rather do by hand, usually.

(I guess I'm looking at this as a way to document my code, not code someone else has written that I want to use.)