#390 Countdown Timer

[Wayne]

Would love to see a feature where you could start a countdown timer on the fly (like A for Alert).
e.g. press Z and get an input box, type in a time like 2:00 and OK to start a full screen 2 minute countdown
When timer completes, go back to current slide.
As per the alert function entering a blank time would remove the timer, or a new time could be entered to override the time.