So... I pulled out a E6420, which is the first Latitude with USB3, but in device manager the USB root hubs were not listed quite like the 6430u and E7440 so I tried it.  It worked as instructed, I plugged in the BFL, let it install the drivers, ran zadig, changed it to winusb, restarted and cgminer recognizes it.  I ran the java API stats and found out my unit has two processors with only 11 engines working on each with a theoretical max of 6072 and already has been hashing at 6GH/s overnight with bfgminer so that lets me know not to worry about getting a AVR Dragon to change anything...

I'm going to mess around and see if I can do anything to kill off the USB3 on the E7440 and get the winusb to work in cgminer, so any advice or experience is still appreciated and any pros and cons of cgminer over bfgminer is welcome also as I want to run the one that's going to give me the best results with 18 BE and this BFL 5GH/s attached.  And I still haven't decided whether I want to run the 18 BEs in one instance and the BFL in another and have two workers where I can stop one without the other and count their stats independently or just run them all together in one miner instance and have one worker with everything combined.