We'll have to agree to disagree then i'm afraid, i can see moving the joystick while aiming being pretty easy tbh. Either way you'd only need to use the joystick on one of the wands in this case, therefore the aiming one wouldn't need to be the one for joystick use. Imagine for example using the left handed one as a movement joystick, but if an enemy got close you could then swipe it to attack with your knife.
Try with a TV remote imagine, sitting on the couch pointing the controller up in the air and constantly moving it around in 3d space while trying to move a pretend joystick. Like i said the DS3/mote combo is being used by RE5 others may decide to use 2 motes or even a mote and a PSP with the screen like a vmu!