Describe your feature idea
Include 2 arguments with the sender UUID and if the message is hidden (prefixed with $) on the chat event of the chat box.

Describe alternatives you've considered if you've any
For getting player UUID: Connecting to an API that returns the player UUID along with other info.
For checking if message is hidden: None.

Additional context
Maybe use it like this:

local _, name, message, uuid, hidden = os.pullEvent("chat")
if hidden then
  -- do things...
end

Added in 0.7a