Dynamically adding fields in Get Widget form

In "get widget", can we dynamically add more form fields to take data from user?

I have a widget called Alertpedia (http://www.widgetbox.com/widget/alert...) which displays a form on the container webpage. The form has fields that the visitor of that webpage can fill and ask to be alerted when the webpage has content pertinent to those fields. simple enough.

When the webpage publisher is grabbing the widget, I'd like him to be able to specify the number of fields in the form. Based on that the Get Widget page should show some empty fields where the publisher can enter the title / default value / etc. for those fields.

But this doesn't seem possible with the Get Widget today. It has a static set of fields that I as the widget creator have chosen.

Is there a way to do this? thank you!