Quote Originally Posted by Keld Denar View Post
Also, you don't need a house rule for INA to work for a monk. UASs are natural attacks in ALL regards, EXCEPT for the fact that they make iterative attacks (which normal natural attacks don't). INA is a perfectly legal choice for UASs in any circumstance, assuming you meet the +4 BAB minimum.
Pathfinder lead developer/one of the lead developers made a ruling that it doesn't work. Used incredibly flimsy/no rules justification for it, so it's basically a "because I don't like the idea, that's why", but it's officially the intent for Pathfinder that Monks do not use INA and might have made it into an actual errata by now. (I suspect a similar negative answer would be given to any question regarding a PC taking a 'monster' feat.)