Connect due date and appointment date
When an action is linked to a calendar appointment, the due date has no real connection to the appointment date. It would be nice if there were an option to link the two so that if an appointment is added to an action, the due date for the action could be the appointment date. If the appointment gets moved, the due date should also be moved. This behavior could be optional with something like a "Sync with appointment" checkbox to control the behavior.