Please get some community feedback on how this should be added, modifications to chat greatly impact every community.

This idea makes sense, and I welcome and encourage it. This will be useful for mods and broadcasters to easily show they've responded to a question or concern, group bot replies and overall improve the chat experience, but its current implementation is messy. Consider reviewing the user experience that this holds. Although early and only a snippet of what the FrankerFaceZ maintainer has done, here is a prime example of a much better integration you could have:
https://twitter.com/SirStendec/status/1293255682070913027

Having 12h times is confusing, since where I live, all printed times are always given in 24h format.

I'd like there to be a UI option to switch between.

If feasible, the default settings whould depend on the user's locale, so most people would never need to touch it - it'd be "right" for them automatically.

Sometimes we want both badges to appear (founder and subscriber badge). It could be nice if both can appear at the same time and specifically if founder looks like a flair on the main subscriber badge.

Need a short way to disable inbound raids for a nominated number of minutes.
Proposed use-case: Im streaming and I know I will end in say 10 mins. It benefits no-one if a raid-in occurs during that last10 mins. Being able to issue a short command to temporarily disable Allow raids would be quite utility in nature
At the end of the time specified the raid settings as per channel settings would be restored

For over a year now, many users have to reload the Twitch page to see new whisper.

To turn on or off the timestamp for chatmessages is a great feature but, it's very annoying you can't select 24 hours format. Please add an option to select between 12 and 24 hour time format.

If you want to make it easier for users to follow a conversation (which is a good idea, even if this implementation seems messy), let their @ mentions be a separate tab that they can click into and see, rather than cluttering the main chat experience.

An idea that would help streamers control chat from back seating when playing puzzle games.

Allowing mods to put singular users into emote only mode if repeat offenders.

Allowing extra blacklisted words and phrases to be activated when only in this mode. (blacklisting things like 'the other way' 'wrong shape' ect ect.. for aslong as the mode is active.

Adding a banner somewhere in chat or overlay somewhere letting users know anti-backseat mode is active and not to do it.

I think you could follow the chat easier if it was not immediately pushed one line up, instead it should be pushed in from bottom with a small animation.

the speed of the animation could be calculated by an algorithm involving messages/minute(second) the more messages the faster the animation.

The ability to @mod so everyone who is a mod gets to see the message and not just the one the persons @'ts

Add a follow button to the in chat user interface. We now have the ability as a streamer or viewer to add friends, whisper, gift sub, see previous messages etc. but no ability to follow directly from chat. It would save multiple clips and the additional need of opening another tab. Personally I have other streamers come into my chat and I want to follow them right then while I'm live.

To help combat hate raids while streamers are off-line, how about a feature to disable chat when a streamer is offline? It can be a simple feature toggle "Disable off-line chat", or even include the ability for viewers to chat for a period of time after the end of stream before disabling. Also, a switch would allow streamers to leave it on, in case they use it for community features.

The same way you can blacklist and whitelist terms in the chat, it would be useful to be able to whitelist links in the chat. Using a bot for this is not ideal because the links is deleted by the bot and still visible to users with extensions. Messages with links should not be sent at all and some links/domains should be whitelistable

The word "trans" alone is not a bad word and therefore should not be censored in Twitch chat. It seems silly to censor "trans" in chat, considering it's just a shortened version of"transgender," which exists as a stream tag.

Currently, removing a viewer's message also removes the previous message. Allow the removal of a single message.

Twitch should create a chat badge for editors, such as VIPs, administrators and moderators. It can be a square with a pencil inside, for example

So i have been streaming for a little bit now. I really like watching twitch streams from other country's but its hard to talk to them because of language difference. yesterday i was streaming and 12 Korean natives stopped by. They Knew a little English but not enough to type it. it would be cool if chat auto translated so streamers or viewer could read the chat. i wanna know what they are saying in chat when I watch Non English streamers and it might help streamers reach more people