I tend to use Pitbul for my overall UI, then the default frames with only the tanks shown (i myself am a tank) as a sort of multiple focus. That way i can see all their debuffs, quick intervenes etc (3 tanks in 25man).
When i used default frames (when they were updated to the new pitbull look) it also bugged me that it didn't show icons, and simply doesn't have an option that i'm aware of. This was one of the many reasons i switched back to Pitbuls raid frames.