I've had an idea lately, which might make newer servers with merged domains to be more easily accessed across domains.
When creating a specific thread, you first need to choose Language, which automatically redirects it to the domain of the chosen language... which is fine, but with Anglosphere being a thing now, wouldn't it be a bit more practical, if you could choose multiple languages so everyone from each language domain could view the thread? It would be somewhat of a cross-domain thread, where people from every selected domain can post in that specific thread, without needing to select other versions of English as their language in profile settings.
So instead of this:
You would have this:
This would also be much easier for announcements, like certain News, Events, Promos and much more...