Well, since 4.0 is all about costumization, how about you'll be able to make your own icons like the chatballoon icon?
You could, for example, make your own OOC icons without making it hud that way, and you'd just need to press it to be constantly in OOC.
My leet paint screen;
http://img426.imageshack.us/my.php?image=feature4ra.jpg
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