Immo aura and FR needs to be held for aoe/cleave? Not quite. Immo is there to build fury faster, regardless of ST or cleave. FR is there to move from point A to point B faster. The only reason to FR an add pack is if you took that one talent (which i don't remember the name of since no one should have been taking it since implementation). Eye Beam and FelBar are the only things you might want to hold for an add pack on a boss, but there are very few fights this expac you should even have FelBar talented for.
Its like you're trying to compare BM to some fucked up havoc build where you're taking every extra button you can just to make the spec more complicated than it actually is.