Reply To: changing text field to drop down

Ok thanks for the fast reply.

I know the answer is likely no, but could a custom field, or one of the one of the extensions, be modified to act like a dropdown or select field (like what happens in the category form field) or just a list (like what happens in the extensions). Only requirement is that when clicked it filters out all entries by that one field. I would then hide the country field from the form