[dpassens]

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?

[grraaaaahhh]

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

[spondylosaurus]

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.")