Back in the day, when there were few communication options open to narrators, this may have been a really useful piece of functionality, so I'm absolutely not dissing the original decision to have it.
But now that there are character comment areas, PMs, discussion areas and comment sections, allowing for a 'nudge' seems to just encourage narrators to use a non-communicative automated response when a message would do a much better job.
Having spoken to some other folk, I've discovered that Storium users, on balance, find nudging to be irritating at best and at worst downright rude. If you think about it, any piece of functionality that uses a word for unsolicited physical contact probably isn't the best idea (even Facebook changed 'poke' to 'say hello')! Given the prime importance of communication on Storium, it seems like we might want to lose a setting that allows for sending an automated message instead of a personal one for such a situation.
I realise that nudges count as 'high priority' for the purposes of notifications, and that mere comments/discussion posts don't (unless you're @ed in the case of comments). I'd suggest getting round this by replacing the nudge with a 'send game alert' or similar, where rather than a push button that sends an automated note, the narrator gets a mandatory message field to send a high priority message to all players. This would have the added advantage of being more generic and allowing the narrator to use it for other high priority notifications that they want to ensure all players see.