When creating Radio Buttons they are all given the same ID which makes it impossible (in Chrome) to select the radio button by clicking on it's corresponding <label> element. They ought to be given unique IDs.
Also, when creating a <select> element its name attribute is missing a closing quote.
This looks like a very promising form-creation plugin! Wondering about the domain licensing for the pro version: when I buy 1 copy of the plugin does it entitle me to use it on just one domain?