Although a batch assignment for notification can come in handy sometimes (depends on how it is implemented), I think an ignore feature is more in place here. So instead of assigning multiple notifs, assign 1 single ingore-thing to a user...
So, in short: nice idea
....
The plugin
StuffPlug-NG has an ignore feature, but I don't know exactly if it also ignores this kind of popups. If it doesn't do this kind of thing, then maybe that's also a suggestion for StuffPlug-NG...