Here is a list of command line emotes for NWN2. Some of these are accesable through the context menu. If you know of any that aren't on the list please post them or PM them to me and I'll add them.
NOTE: "Cheer" in the emote context menu is actually a wave.
NOTE (again): The ones with quoted text next to them means the PC uses their voice set.
/bow
/dance [1,2,3]*
/flirt
/kneel
/laugh "Laugh"
/no "no"
/point
/pray
/salute
/scratchhead "Bad Idea"
/sigh
/sit
/taunt "taunt"
/thanks "thanks"
/threaten "threaten"
/tired "Need to rest"
/victory "Cheer"
/worship
/yes "yes"
*There are only two types of dances, even (0, 2) and odd (1,3)
EDIT Nov. 16, 06: Added /taunt, /thanks and /threaten