/smoke
/spit
/giltoss
/wipeface - think back of the hand style like vaan in ffxii. pretty smug
/headnod - Upwards headnod like balthier in ffxii
/stopthat - Hand in the face of another pc/npc
/highfive - you could offer it to another player, they have to respond accordingly
/highten - you could offer it to another player, they have to respond accordingly
/handshake - you could offer it to another player, they have to respond accordingly

I would also love "walking" emotes like day dream, reading, etc that you could do around town instead of full speed running all the time.