More flexibility with email send rules. It would be extremely useful to be able to have greater freedom in customizing email automations. For instance, we would like to be able to have an email automation that sends to a volunteer once they've been assigned a particular role or qualification, after they've already completed the sign up process.
I think this is a great idea - in addition to this it would be great to be able to add "tags" into the body of the emails - or at least custom field's to pull from.