Emotes are very underused in gw2 and quite hidden, I'm not even sure how outside Halloween anyone could know about them when new to MMOs.
So small suggestion and make it optional (via checkbox in options)
An Emote UI window,
it could be like an expandable slide bar over the chat box.
The Icons for them are partial already made so all what's needed is to make a nice layout design and make it not to big and as said optional to use.
I myself would like that since I cannot remember all the emote names and typing them is u know...