Maybe I am going about this the wrong way and I need to get something like http://www.amazon.com/SanDisk-Cruzer-Low-Profile-Drive--SDCZ33-032G-B35/dp/B00812F7O8/ref=sr_1_9?s=pc&ie=UTF8&qid=1400271425&sr=1-9&keywords=usb+flash+drive but 3.0 instead of 2.0, if they even make them yet.
It is really easy to set up in 9.3. I think it was only implemented after they moved boot to ZFS.
I just bought another of the really small USB sticks and stuck one on the back and the other inside. You could buy one of those internal USB header adapters if you wanted to keep them both inside and had extra internal USB header.