Scheduled Messages for a specific timeSuggestion

How to configure the plugin so that messages are displayed at a specific time? For example, at 1:30 a server restart in 30 minutes? Server restart in 15 minutes. Server restart in 1 minute. Countdown...
Is this even possible in this plugin? Are you planning to introduce?

And thanks for the comments in the code!

If this is still monitored, I'd be very interested in this restart warning feature also.