With enough labor, you could annotate enough sentences to cover a lot of dialogue cases. Sections like "'stop!', he said angrily/dryly/mockingly are probably fairly common. You'd be modeling the next most probable inflection given previous words and selected tones.
What would require understanding would be novel arrangements and metaphor to indicate emotional state. On the fly variations to avoid mononticity might also be difficult, as well as sarcasm or combinations/levels (e.g. she spoke matter of factly but with mirth lightly woven through).
What would require understanding would be novel arrangements and metaphor to indicate emotional state. On the fly variations to avoid mononticity might also be difficult, as well as sarcasm or combinations/levels (e.g. she spoke matter of factly but with mirth lightly woven through).