All the deep analysis provided in this thread suggests that 1...Nh6 is more of a psychological statement about white's first move than something that warrants extensive analysis as an objective refutation of 1.f4

Really?? I'm having a hard time believing that this is worth the trouble. What comes next and does it matter? Sure: 1.f4 isn't so critical that Black can afford to give a tempo or two, but this really doesn't seem terribly productive. I can imagine scenarios (after, say, 2.e4) where Black's knight makes its way to g4, only to get kicked back to f6. Seems like a waste of time to me. If you're looking for something offbeat, why not try 1...b6 or 1...d6?

I play this myself, and I'm a Bird player.
Not that it is that difficult to equalise against 1. f4 
, but I like the fact that it can go anywhere -depending on white's reaction, of course- from a From (improved) to the classical anti-dutch. (Somehow this  helps against the known psychological problem of facing your own repertoire.)

If you need some literature : there is a piece form GM Reinderman in Secrets of Opening Surprises (titled Edgy Knight iirc).