P.250 of the Main Rule Book,
Righteous Fury makes the effect of critical damage you roll, without dealing damage and may not be affected by feats that affect Critical Damage dealt such as crack shot as they modify the Critical Damage and not the Righteous Fury effect.
P. 102 of the Hammer of the Emperor expansion.
Under Righteous Blow feat, it specifies that you roll twice to determine the amount of Critical Damage you deal with Righteous Fury which means that you do deal Critical Damage which cancels the reason Crack Shot feat that would not change the Effect of Righteous fury since it is not Crit damage.
Did I miss something, or is that an error?