The A-6 was cleared for (and did on occasion in Vietnam) carry (and fire) the 20mm external gun pod.
Hey, if it's good enough for F-4s, its good enough for the "Sky Pig"!
And West Coast - the A-6 was more maneuverable than you think.
No, it couldn't keep with the A-10 through rolls & turns, but it was more maneuverable than the F-4s that didn't have the maneuvering slats - and no one says the Phantom II couldn't do air-air!