I think it would be cool if there were a way to hop into chat under a temporary username, similar to Discord. I usually invite friends and family to join my stream and chat but they would rather not have to create an account to chat. So if there were a way to assign a temporary username to join chat, I feel like people will feel more inclined to stay in the stream.
I know there's probably some kind of security and privacy risk with this, but if there would be a proper way to track a user's IP (or multiple logins) to prevent continuous harassment; this would be a good feature to draw more people into smaller streams and chat. It's frustrating when people tell me that they wanted to chat but just left because they didn't want to create an account.