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The reason why npcscan doesn't do what you're asking is because it's not possible to detect an npc spawning any more. No addon can do what you want.
Several of the things you listed can be detected through the shouts that they put into the chat when they're spawning, or if you're close enough to view their nameplate, or if someone engages them which puts them in the combat log, or if you leave the cursor over their spawn point so they appear under it, or you camp directly on top of their spawn point so it aggroes onto you.
I suspect nowadays many people generally don't sit and wait for something to spawn, they abuse the fact that you can jump between servers by joining random groups in the raid finder until the "rare" unit phases into view.
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