OK in light of these last couple of posts, what is the expected behavior for this plugin? What is supposed to happen once the account is created inside the zencart store with the checkbox checked for newsletter?

- is the person going to get a confirmation email from MC? In addition to a welcome email from zencart?

- since the checkbox is unchecked by default, shouldn't that be considered express permission and would not need a double-optin sequence from MC?