His rotation is
/click<spam button>
/castsequence Prayer of Mending, Greater Heal,,,,, ,,,,, Prayer of Healing,,,, ,,,,
/cast Dispel Magic

This keeps his mending bouncing around drops the big bomb heal on the tank every 10 seconds or so and drops the big bomb group healing every 10 seconds or so depending on how fast or slow I am clicking. I find this works great as a general all around heal platform.

I do have an Oh Poop button that does like shield, renew, flash, gheal type of thing.

I will have to try some of your suggestions.