Allow authenticated but anonymous responses with one response per person

DaveHH I realize this post is almost a year old, but in case someone else has the issue you had, you could always just add a name field or  first and last name fields to the form and mark them as required.  This allows people to submit outside of your organization, but get their names.

That being said, I was hoping to find an answer to how to keep it anonymous, but only allow one response.  Appears there's still no way to do that.