Why not put a usb on the back-plane? I was excited to hear there was a usb port on the boards and bummed to find out there isn't.
That is totally stupid. This is a standalone unit. Why would anyone be stupid and wish it to be not a stand alone unit?
You have obviously never worked in an enterprise environment or managed a medium to large farm. USB would allow users to manage everything through a single interface and use a single client like CGMINER making all the blades act like 1 cohesive unit. That way if any changes need to be made you only have to do it in 1 place rather than 5,10,20,100 etc. It is far more efficient.