I broke out the USB drivers for the Loox 720 and it appears at this point that it might actually use the USB Host Port 1 on the CPU chip. :)
I need to try and disassemble the OHCI.dll to confirm.
Unfortunately, this means it's not for 99% of users as it requires a delicate hardware mod/addition to the motherboard (see my earlier posts & photos in this thread).
The ideal scenario is for a USB-OTG driver and to verify the hardware will support that driver.
Back to the bench.......
Just found this Microsoft dev blog and a guy who writes their drivers:
Windows CE Base Team Blog : Introduction: David Liao
Q: How is USB OTG supported in WinCE? What controllers are currently supported?
A: USB OTG is supported on CE 6 and Windows Mobile 5.3 or later. USB OTG is a bus driver which host one USB Function (client) Controller driver and one USB Host Controller Driver according the protocol. The Code we supported OTG on Windows CE 6 is Bulverde(pxa27x) chipset (what the Axim uses) and OMAP 730, OMAP 1030