IMHO you only solder and provide traces for what you use & need. There are enough traces and solder points in such a small device. When they say hardware level not supported I understand that is something you can't hack away with software...
Maybe some weird cables a la 770 could save the day but I wouldn't put my money on it...
I for one I want usb otg too much to spend 500e to find out if I can enable it ...