I can't see a way of doing this either.
You might be able to use this approach - setup a source network with the right SSID settings, then use the able to get the current settings, and then copy all of those SSID settings to a new network.
ssidSettings=dashboard.appliance.getNetworkApplianceSsid(fromNetworkId,ssidNumber)
kwargs = {}
for setting in ssidSettings:
kwargs[setting]=ssidSettings[setting]
dashboard.appliance.updateNetworkApplianceSsid(toNetworkid,**kwargs)