Hi Simon,
Greetings!!!
As of now, we do not have any such kind of method in timer service which notified all the user at same time. In our Timer Service you can start or cancle the timer for perticular user. We have recorded your request in our pipeline, if we get receive more request on this then we will plan for it and will send you an update for the same.
If you have any other queries please let us know
We will be happy to help you.
Regards,
Priyanka Singh
App42 Team