You might need to expand on what you mean, because notification in this service relates to moderator approval/rejection and is tied specifically to a parameter that is passed in (it's off by default). That parameter actually comes from a moderator-controlled option, so it's essentially the same as any of our other moderator alert options.
If you want to change this in some other way (which would change the meaning of the notification), extending the service would seem to be the correct approach.