uefi - If USB is not listed in BIOS as a boot option, does that mean the machine can't boot from USB?

I just purchased an Asus Zenbook Prime UX31A-DH51 with Windows 8. I want to wipe the drive and do a clean install but USB is not listed as a boot option in the BIOS. Does this mean it is not possible?

Here is a photo of my BIOS options.

This is the only option I get when I click Add New Boot Option. Not sure if I can add USB here.

***** Update ***** Asus tech emailed and said: "Unfortunately with Windows 8 you can not boot from bios."