What's the feature called in campaign? Isn't it something like "Take a break"? I'd base it on whatever the option is in campaign.
Quote:
Say !away to take a break.
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or
Quote:
Say !away if you need to go AFK.
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And then maybe change the player's name to IDLE <player name> just like in campaign.
You also may want to call TimerAnnounce more often, maybe after every map load. Players tend to have short memories... probably due to zombies eating their brains.