I think the complexity in controlling it is due to the fact that the whole craft is rotating (where's the front..?). If you want to remove that complexity, you

I think the complexity in controlling it is due to the fact that the whole craft is rotating (where's the front..?). If you want to remove that complexity, you need to add a lot more than just another wing and add a number of mechanical parts that can fail. As it is right now, the whole complexity is the software (which should be safely stored). In addition, this design lends itself to small sizes in a great way. Shrink the center parts/electronics/, shrink the single wing and you get a very, very compact tool. Another wing nearly doubles the length of the whole thing.