I agree, zippers on each side would be nice.
Here was Brandon's response in another thread regarding the zippers:
"To answer a couple new questions, there is only one zipper slider, not two like the standard blackbird. It seems it's not possible to get a separating zipper with two sliders running opposite directions. The single slider starts near the farmost tieout up by your head and opens as you slide toward the foot end, unfortunately this means you can only enter/exit on one side, i know it's a tradeoff."