The larger concern (for SE at least) is server strain. We had to beg them to simply allow the filter to not default to on. I think they should break it up into channels, like how the search comments are split up. You can "yell" (or whatever the new term would be) into these different channels for different things, such as crafting, partying, endgame, etc. And this would be viewable from any zone when you open up the menu.

And the strain would be greatly lowered since the "yell" wouldn't have to load on everyone's screen, but only those looking for those groups.