Remember to check out the WiConnect user guide for this and numerous other features.....
http://wiconnect.ack.me/1.2/variables?s[]=setup&s[]=gpio#setup
Command Sequence
> set setup.gpio.cmd "network_up -i softap"
> set setup.gpio.control_gpio <gpio #>
> save
Bring the <gpio #> HIGH, power cycle or reset the board, continue to hold <gpio #> HIGH for 3s, the softap will start.
For Mackerel, (the main dev tool for the AMW004 Wallaby module) button2 = gpio.11
For Schematics on the Mackerel tool see the docs here
Also check out this new tool