arduino Wifi Shield with HDG204-chip SoftAP

I looked through the manufacturer's documentation and this chip does indeed support SoftAP and ad-hoc mode. I'm having an issue trying to find the API reference so that I can modify the Arduino library to enable this functionality. Anyone got any hints?
For those wanting to know, this would be a way to have a default SoftAP mode for an Arduino based device that a customer can connect to with their iPhone and configure it for their network without having to know anything about Arduino.

You would probably need to reprogram the firmware to do that.