In HS4, I just tried to create an event where a timer's value is the trigger, and left the input section for the value as all 0's.... it wouldn't let me save it. You can enter 1 or -1 seconds, but not zero.
The only place I have used timers is on triggers that need to be debounced. For example if a mechanical switch is toggled it will go through a period of rapid transitions. The timer greater than 2 seconds is used as the event's condition where one of the actions when the event occurs is to set the timer to zero. It means the timer is always running and it does persist HS4 restarts.
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