My LGS owner used to go to quite a few Ard Boyz tournaments and some of the bigger tournaments and he despises the INAT FAQ because they often nerf an army more than it should be nerfed. Even though in other areas they seem to power up the same army.
His solution when he runs tournaments is the solution given in the main rule book. If a rules dispute arises and neither person can agree as to how the rule should be read they roll a dice and the person with the higher roll is the one that gets his way...but only for that one time. If the same rule comes up again, they roll again.
It seems to work fine and doesn't require hours of digging through rules to try to find the answer.