This is the best article I've found yet on how to take advantage of USB 3.0 when it's needed most - during OS installation!
Serves as a great starter tutorial on using Windows Image format (.WIM). The image (sources\boot.wim) is mounted first. Then drivers are added. then it's saved and unmounted.
Just remember to change the filenames to match the filenames for your usb 3.0 drivers. For my Fujitsu UH572 Ultrabook they are iusb3hub.inf and iusb3xhc.inf.
How to install Windows 7 from a USB 3.0 Thumb Drive (FAST installation!)