Suggestion: More Chat Moderation Features

I'm the head moderator for a somewhat large stream, and even with bots it can be really frustrating to keep chat at a decent readable pace for the streamers trying to interact with it. (Especially for Q&A where EVERYONE spams the chat.)

I often think of how nice it would be if I could set a different duration on slow mode for normal viewers and subscribers, so I could give subs priority without having to go full sub-only chat.

Being able to set a cooldown period for new viewers before being able to send their first message would be extremely helpful, so people who just popped in wouldn't be able to ask a question that just got answered or is about to be answered.

Having a global slow mode for the chat where each message is displayed at specific intervals, since /slow only limits per-person which still allows thousands of messages from individual people to go through, making chat unreadable. This could be used in conjuction with the different slow times for subs and normal viewers to make it so chat is always readable without severely limiting individual viewers' ability to chat.

Even with the /r9kbeta I barely notice any difference, and my inability to directly limit the overall speed is significantly impacting the quality of the streams. I would love for Twitch to actually go in-depth with chat and add some of these improvements, and anything else that might help!