What does "better management of your rig" imply? Do you need to place your GPUs 6 ft away from your motherboard? 
You could get hold of at least one thick usb 3.0 cable of the minimal length you need for your management and see if it works, as a trial. One single cable male to male cable, no extenders. There's no reason why it wouldn't work. Once you determine what works for you you can buy more...
You could get hold of at least one thick usb 3.0 cable of the minimal length you need for your management and see if it works, as a trial. One single cable male to male cable, no extenders. There's no reason why it wouldn't work. Once you determine what works for you you can buy more...