Said I was blueskying stuff. Defer to your experience on most of it, especially on the mitigation. (What was I thinking?!?)

I disagree on two though.

"'Spell with a big single target + small aoe splash heal effect. May or may not cross groups. (Be nice a nice talent for holy priests, no?)'
Chain Heal. Or CoH."

Neither chain heal or CoH does what I described. Think greater heal that bombs the MT and heals all the melee DPS for a much smaller amount. Slow cast that'd scale usefully with haste. Wouldn't be any use for raid healing (chain heal, coh). More likely to be an effect added from inscription than an entirely new spell.

"'Pallies will get a very powerful cone, group crossing, aoe heal on a long timer. [...]'
They had consecrate heal people before, and it got taken out fast."

Did you read what I wrote? It'd be a coc that heals. One shot large (it'd have to be quite large to make it work) directional heal on timer, nothing like consecrate at all.

Totally situational use, try to squeak out of a wipe sort of thing. If a talent, it'd be junk. No one would spec it. Trainable...I think that'd be an interesting tool. Do I as holy pally run in and blow a 30 minute timer to keep struggling tank and the remaining dps up--and can I hit them all with my cone heal--or stand back and heal the tank and hope the DPS stays up for the last few percent of the boss? It'd be a group heal that wouldn't step on the abilities (such as chain heal) of other classes.

Mending sort of covers the healing pull idea, which there's no real need for anyway. Again, was tossing stuff against the wall to see what'd stick.