I think I misunderstood your question. I thought you were talking about the automatic notifications that go out when you check the notification box in a client event.
If you are instead referring to the notification designer in the workspace, then there isn't a template--it uses whatever you put in the wizard. I don't think there is an easy way to include HTML generated elsewhere, but I like your idea of being able to paste HTML into the control.
If you're up for a little custom work, you could create your own custom event assembly that could implement some sort of templating mechanism for email.
David
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