Custom Stream Warning Message
When you mark your stream as 18+, users will get a warning message the first time they enter the stream, warning about things like strong language.
What I think would be a good addition, is for the ability to either customize this screen entirely, or add text to it to warn about things such as flashing lights, loud noises etc.
Not only will this help prepare everyone for what might be present in the stream, but it would also help those with health problems such as noise/light sensitivity, epilepsy etc. to know what the stream contains and then make an informed decision based on their own health whether or not they want to continue to this stream.
I have seen plenty of streams that have alerts that are flashing images and contains VERY loud noises, and for some people these can pose problems that not everyone might think about.