Thank you both very much!
Unfortunately the radio button is mandatory. The goal I am trying to achieve is to be able to pre-fill a form if a previous submission was declined, making life for our users a little easier. I created a checkbox that only appears if the appropriate information is in the URL (which is built and emailed upon a form being declined in the PAM process). That checkbox is a "Pre-fill form" checkbox and when clicked, takes all of the form data submitted in the URL and fills out the form with the same information as the previous submission.
This was the only way I could find to achieve what I was looking for. The onLoad doesn't work perfectly as there are pieces of the form hidden and only visible when certain selections are made. When I attempted to fill them out programmatically, it hit a certain part of the form and stopped. I believe there is more happening after the onLoad event triggers, which should not be the case. However, when I made a checkbox, the form has a chance to fully load before the checkbox appears, solving my issue.
-EDIT-
Will there be a hotfix available? I know our agency pays for support and our main admin was going to be submitting a request, but we were beaten to the punch.