5.56-burn-on-my-collarbone BUMP
I'm not a lefty, but practice working with my rifles as a southpaw anyway, having mangled fingers and spent lengthy periods time with either hand in a cast at various periods. And you never know when you'll have to deal with the offside of a doorway or building corner, or from the driver's side of a vehicle.
While having hot empty brass bounce off my nose is indeed an irritation, it's not quite as bad as having a HOT! empty case get caught between my glasses and eyelid. That's downright distracting.
Nevertheless, I've worked with bullpups extensively, and like them, and of those I've had some experience with, the French FAMAS is my first pick and the British SA80, much despised and condemned by those who've never used or cared for one, comes second. We'll see how the Tavor does, perhaps fairly soon....
But I have a few ideas of my own, too, and like I said, downward ejection would be the way to go. Of course, if I could have ANYTHING....