There's a surprising lack of positive emotes among the choices offered, I can /jeer and /taunt and /brag but I can't /clap for a performance or /thank another player for buffing me. I thought I could /wave at people but the flavor text will say i'm waving in the air like a loon (NOTE: not sure if this is true, i've tested it on a pig but never on another player.)

Emotes like these always come in handy when you're in a hostile zone and you still want to be courteous, I always used to set up macros for them in EQ to thank people with a click and move on. I'm falling head over heels for this game but as superficial as it might seem this is one of the things i've been finding myself missing the most so far.