Dennis @ PerfectForms
If you send the email notifications to a role the instance will know which role the user occupies. In other words, you can add arguments based on the user.
An instance cannot change stages without interaction., but you can send a notification after three days if the stage has not changed. If the stage has changed, the delayed notification will not send.
No the form does not check conditions after it is submitted. It will only change stages with interaction.