I've ran into two other issues...
One is that if someone is Unconfirmed, they are still apparently getting confirmation reminders even though the checkbox to send them is unchecked, or in the case of the direct url "noremind" is set to 1.
The second issue, is that the unsubscribe on the confirmation reminders appears to be broken. If they sign up for the list, but then don't opt in for the confirm, they should be able to unsubscribe from the confirmation reminder.
Thoughts?