I remember an old white magic spell called Zombie (iirc) which allowed healer to pretty much become a very effective single target damage dealer. Basically if Zombie landed on a mob it would gain an "undead" effect to which any healing spells cast on it could do pretty nasty damage. I miss these kind of spells, they were very creative and just made the job more interesting.

But yes, I would love to see a return of offensive type spells for WHM for that extra bit of versatility and survivability should the situation arise.