I suggested it too in the last Misadventures at the end of my long post : Grim Misadventure #176 - So the New Thing - #98 by tqFan Would be great for many other skills like Forcewave, Phantasmal Blades, Vire’s Might and even more when you’re playing on a controller and cannot target behind group of monsters to not have anything highlighted.
However to be fair, it must be said that’s there is already a solution called Force Move. If you press and hold Force Move button (before pressing and holding AAR button), your AAR won’t lock on any enemy. But you have to use another button for that. Or use a macro / autohotkey that presses this additional button for you everytime you channel AAR with RMB.