Ability to set reminders on issues at a specific date/time

Often support tickets need to have the ability to set reminders. the customer who raised the ticket may not be available or you have booked in an installation or update for a certain time they are free to limit service disruption.

Date due should have the time and you should be able to set reminders via an email nag or hip chat notification etc. + Team Calendar integration with Time and reminder would be a plus.