Have you tried setting up a Template Poll on your account? A template poll allows you to set all of the default settings on a single poll question and then apply those settings to all of your current AND future polls.
For example, if you set your Template to require registered participants > then all of your future poll questions will have that setting by default.
Read more about how it works here: https://www.polleverywhere.com/guide#setting_a_default_style