Hi Mike,
Basically the module takes the URL from a dropdownlist option (the text is the name, the value is the URL) within the DynamicQuestions.ascx file. I can get you exact instructions I f you need them and also post those to the forum thread in case others have this question. We have had a few other clients implement similar solutions such as yours.
So the file would be under DNN\DesktopModules\Dynamic Forms\
and is called DynamicQuestions.ascx
Open the file in notepad and just do a search for "cboAuthGateway". You can add a new list item there or you could modify one there.<!--
Hope this helps!
-Chad