Have added a “Mood Variations” extension to let authors mark up text to have varying effects depending on the mood of the person currently spoken to. It’s meant to be compatible with several approaches to conversation (and uses the same “current interlocutor” variable as Eric Eve’s conversation extensions). The “[set {mood}]” token then also lets you set the NPC’s current mood in the middle of other text.
Not a huge deal, really.
Emily Short's Interactive Storytelling 