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It's not specifically about them but if you look at the Ork FAQ it states that Old Zog can't use either of the special Ork powers that are shooting attacks because of his BS 0. Sad but true all witchfire powers are shooting attacks per the section about witchfire powers no matter what way they fire. There is nothing in the beam section which states that a beam is treated as anything but a psychic shooting attack.

You are making an assumption that they are their own thing, they are a subset. Just like Jump infantry is a subset of infantry. Therefor you follow all rules set for witchfire except where beam tells you otherwise not only the rules set fourth by the beam section. If you follow only the rules for beam when do you fire it? Never as you are never given permission to fire it in any phase.