Emperor on a Pony this thread is a swirling mess.
Gunslinger: Read the damn title,
GUN slinger. Not Psychic power-slinger. Pistols only. It follows the rules for "normal" shooting (i.e., pistol shooting, not psychic powers, which cannot be classified as normal). Just because the model has two pistols doesn't mean he is following the rules of normal shooting when not using his pistols.
Now, if the rules were written a little bit more clearly on page 69, the confusion would probably disappear. A Psyker forgoes traditional shooting in order to use a Psychic power in lieu of his normal weapons. This is an absolute, this isn't up for interpretation even if the words are poorly placed in the rules. This has been canon with Psykers since I can remember.
This sentence: "However, if he can shoot more than one ranged weapon per turn, he can use a different Witchfire power in place of each (assuming he has enough warp charge).", is the root of the issue, you cannot shoot a gun and a psychic power in the same shooting phase (at least not according to the rules as laid out in the first paragraph of the Witchfire entry) the argument for firing of multiple Witchfire powers in one phase wilts when the model itself does not have the ability to shoot two Witchfire powers in one turn. If a model can manifest more than one power per turn, it cannot fire multiple Witchfire attacks per the Witchfire entry unless specifically stated that it can, at which point, I wouldn't argue multiple Witchfire shots due to another rule (Gunslinger for this argument), of course this could be subject to change with forthcoming books, but for the sake of my argument and for the sanity of others, I will argue based upon what rules are laid down as of right now.
Which infantry models can do this (i.e. fire two different weapons in the same turn)? I can only think of one type outside of special rules for some rare exceptions. People with two pistols, while
firing two pistols that shooting phase (which, interestingly enough, is the only phase they can use them in this manner :shocked:

) are in perfect alignment with the Gunslinger rule. A Psyker with two
PP's and two Witchfire powers can either use: 1. Both
PP's in the shooting phase 2. A Witchfire Pyschic power in lieu of his pistols or 3. Some forthcoming special rule unique to the model allowing multiple Witchfire powers in the same phase. 1 and 2 are definitely legal right now, 3 is unknown and anything other than these three, to me, is blatant abuse of poorly worded sentences.
Of course, a
TFG will take the wording a run because it isn't specific about which "weapon" being fired. Now, I've seen some pretty slick rules lawyering in my day, but this is almost the tops. Psykers cannot shoot regular weapons and psychic powers in the same phase, period. This is incongruous with years of
40k rules, rulebooks, fluff (why would you need to use a pistol and a psychic power at the same time? C'mon man!

) and actual play.
Of course, the Rulebook is written with newer Codicies forthcoming, so some of these rules don't make any sense now, but they certainly might with the newer books and rules coming.
This may be a lesson in excessive pedantry, but sometimes that's what it takes to breakthrough stubborn adherence to something is abjectly wrong.