Yes! Learn Stats Now is completely free to use.
Learn Stats Now is designed to collect and store as little user information as possible! Since our system is based on temporary usernames, we do not collect email addresses or require any personally identifying information. We only store metadata associated with each interactive session on our servers, and this data is deleted when the interactive session is ended or expires.
Yes, you may submit a feature request here.
This is not currently possible, but we are working on an editor interface that we hope to make available to users sometime in the future.