Hello, this plugin is great but I have one problem. I'm trying to create some polls and only want to user to be able to vote once per poll. I can black based on cookie or IP but only for a certain number of days, if I change the poll I want them to be able to vote on that one, but only once per user (cookie or IP is fine.) I can do this only for logged in users ("Limit Number of Votes per User: (Only for logged users)") How can I get it to only allow one vote per person per poll? Thank you!