What about a new mode? Like TWITCHCLIENT 5 or something similar that sends joins/parts and <jtv> SPECIALUSER user subscriber.
That would be great for scripts to parse these messages and display subscribers and turbo in another way than other users. Twitch’s admins/mods could also be displayed more irc-like with an ~,& or else. A message like SPECIALUSER user staff isn’t very useful in a query 