Many of the things you suggest are already here
Viewers can suggest idea, debate & vote about them here : https://twitch.uservoice.com
You can also participate in survey when Twitch wants to ask question to the community here : https://rpg.twitch.tv
Soemthing funny, if you start profiling everyone, you will get complains about twitch being intrusive and looking at our private life. So being able to filter other users? There is really no need for it. Just find communities that you enjoy talking with.
Futhermore, this subject should not be posted here but on uservoice. This forum is aimed at 3rd party developer support