Idea for more dialogue interactivity: non-dialogue dialogue choices.
Basically this requires emotes, like in WoW or NWN. With console commands like /greet, /laugh, /wave or /dance, the player character would greet, laugh, make a little dance or wave at a target. If such emotes were implemented, which they should be of course for even more general interactivity in an already interactive game :p -- they could be made available in conversations.
He: Come here, look!
She: (seeing a beautiful pheasant) Wow!
He: Isn't it pretty?
She: I've never seen one up close. Let's shoot it.
He: <laughs>
She: What. I'm serious. We should shoot it and eat it. It's really tasty.
Could be a bit more natural than only alternating dialogue lines. Also, there's interjections (don't let someone finish a sentence) or silence (not saying or commenting on something).
