What sort of things would you like to see? Though i'm not sure if bungie should actually listen to us all the time, its fun to think of what could have been.
I think it would have been cool to see the sunsinger use "solar wind" as a team buff cone or a team heal.
Song of flame would heal people around you, or just have a wider range of effectiveness and be more effective period.
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I always thought that song of flame would be something like "boost allies with light (all affected guardians deal more damage)."