[Plugin: Gravity Forms Custom Post Types] custom taxonomy using content template

I created a non-hierarchical custom taxonomy based on the city someone enters in a form. I’l like have the form set this taxonomy automagically. I tried using the single line text field which does let me select the custom taxonomy but I can figure out how to populate the field with the city from the address. The ‘create content template’ option isn’t available for that kind of field.

http://wordpress.org/extend/plugins/gravity-forms-custom-post-types/