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Is "Would you like some more?" really a good example here? It's not really implying that the person asked ought to eat more, is it?

It certainly can. For instance, when the speaker is my mother.

Maternal imperative mood: Any order or command phrased as a question, despite being non-optional.

Example:

"Do you want to turn on the fan?"

(Standard imperative equivalent: "Turn on the fan.")