This would be valuable for live presentations. If you are running a meeting, things are going to go wrong. The next speaker might be late or they might have computer trouble. Many times, both. Having the ability to seamlessly add minutes to the board with little distraction would be nice. That would subtly notify the speaker to continue (stretch) the presentation.
I am researching using Miro for presentations. It would be nice to have a feature where only the moderators saw the timer.