Limit the number of streams/chats that a single account can be logged into simultaneously. I've noticed that there are a lot of bot-accounts that appear in EVERYONE's chat rooms, but never as viewers. These accounts seem highly suspicious, and I personally would feel better if they were no longer able to "infect" twitch with their frivolous logging of every chat's activities. Besides the fact that the chat replies from Twitch could be used as cheap DDoS source, they could also be exploiting the chats to infect their users in some way.
I think that a limit of 10 chats/streams for a normal user would be way more than enough for any one person. And for any known bots that need to be in multiple chats at once; an option to allow them could be put into the channel settings for the streamer to permit them on a per bot basis.

I have an issue with bots in my chat. I don't need to see them listed alongside real users. What I ask for, is that you can right click them and "label as bot". Putting them into a different kind of 'listing' on the 'see who is in your chat' popup. This does not mean you kick them, or ban them or etc... it just means that "you" can see whether they are bots or real users. Or any User on your channel when opening up the list of viewers, can see that they are at the bottom, listed under the Title of "Bot". You can also do this to people who are not bots, but ONLY within your channel.

If Twitch then saw that an account was listed hundreds of times as a Bot... it would be a great way for Twitch to easily be able to scan these accounts and determine whether they were active bots breaking ToS or not. Would be a great easy scan tool that was done by User intervention for Twitch.

3 weeks ago a user entered my chat tagging as "Soporte_Es" pretending to be a moderator where he wrote in the chat that in the next few minutes he was going to be banned and he effectively banned me, when they unbanned me he banned me again for no reason by entering my chat and insulting me (I have proof), this happened to several more streamers from Argentina and twitch I inform them that it was their mistake where a user had found a BUG on how to ban accounts. They told me that this is solved (account that pretended to be a moderator is banned) and they returned my account (and the others), but did they take the bans that this user put in my account? because I already have 3 bans (2 for no reason)