While we're building this wish list... what about a feature that would automatically unsub someone from list #1 when they subscribe to list #2.
List #1 are prospects, once they buy they join list #2 (buyers) to get the download info and are auto-unsubscribed from list #1
List one gets initial sales messages, List 2 gets backend sales messages
It could be set up as actions to take on subscribe.
i.e. "On subscribe also subscribe to/unsubscribe from list #"
Dean