Hmmm, I actually am not too keen on this idea. First, some folks may be using a smaller monitor so that white space you are seeing may not even be available to them. Second, this window is already pretty complicated and, for me, is sluggish for scrolling so more active components will only make it worse. Finally, BIAB already suffers from every-square-inch-is-packed-full-itis so adding more just makes this worse.