Excellent job,
I'm trying to in my usb ( WinSetupFromUSB )
for install FreeBSD, GhostBSD, MidnightBSD & pfSense but actual procedure from iso not work.
i found this post, maybe this can help developers for include into WinSetupFromUSB
http://www.easy2boot.com/add-payload-files/freebsd
http://rmprepusb.blogspot.co.uk/2015/03/easy2boot-163-beta-3-now-supports.htm
and provide tutorial
Thanks in advance