There’s a little game I play now and then called Wanderlust: Rebirth, it has a class called a Cleric that is somewhat reminiscent of the Guardian. The Cleric in Wanderlust has a unique ability that damages nearby foes of anybody he overheals. I thought something like this would be nice on the Guardian, perhaps not AoE damage on overheals as I’m aware tanky support builds are already quite durable and I wouldn’t want to push their damage too high as they’d just get nerfed.
Something along the lines of a boon on over-heal or AoE weakness or, dare I say it, AoE cripple (:O) or something! Anything! Up to ArenaNet’s discretion.
I just thought a good candidate for a trait or something could be a positive effect upon over-heal. It would also make Cleric’s gear quite desirable as I get the feeling people don’t like it that much, although I quite enjoy my Cleric’s stuff! 
Anyway, just a thought, I can live without it in the game of course, I would like to hear other people’s opinions on the idea.
Kaimoon Blade – Warrior
Fort Aspenwood