It would be useful with a permission that people could have which prevent other players from spectating them, without the need of toggling it manually :)

I agree with that.

Yup, that's an issue with every plugin out there doing similar things, which is why permission plugins usually warn about this. It's super simple to solve by giving ops a negated permission like -spectate.hide and I don't think we shouldn't implement this because the average server owner is stupid :)

Fair point. I'll see about it :)

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Problem: it's really hard to stop op's from automatically inheriting the 'spectate.hide' permission, which does away with the install and play possibility if everyone is given all permissions ('*').

Should I add a message that says "Hide mode is enabled" when players with this permission join? Or should it remain silent?

Just let it remain silent imo :)