You can't see what the person writes before he / she presses 'Enter' with a plug in whatsoever. The 'user is typing' message is triggered when the user presses a key but there is no way to find out what he types. It would be an invasion of privacy too and you will see what he typed when he hit Enter. There is a way but just with some illegal methods
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Stuffplug NG only notifies you when someone deleted you because any type of blockdetection isn't working any more, maybe a log or something will be included in Stuffplug NG 2..