It would be extremely easy to add, just add these few lines of code into the init.lua file and you're sorted.
function GM:PLayerDisconnected( pl )
local name = pl:Nick()
local id = pl:SteamID()
pl:PrintMessage(HUD_PRINTTALK, "Player "..nick.." has disconnected from the server. [SteamID:] "..id)
end
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