Full Emoji picker
Current emoji picker shows emojis only when typed at least 2 characters. People have no idea what the emojis are called / what exists, so we need a full emoji picker (like in slack) where all emojis can be browsed through.
This feature is complete and shipped with v3.8 on April 16th.
Instead of a full emoji picker (which can be a performance concern), why not have a list of most recent emoji come up when you just type ":". The list of recent emoji can easily be stored in localStorage.