Jack Simth said:
It's a curious quirk of wording, but while a Core Wizard can never learn a direct healing spell, a Core Sorcerer can.
Oh, good! I thought I was the only one who noticed that years ago, still in 3rd edition
My only problem with it, is the research part on wich I'm not so fluent... though I believe it should have a much harder DC to learn, since the sorcerer is trying to (almost literally) 'knock on heaven's door'

Maybe with some alignment, caster level or deity affiliation prerequisites, or even with some roleplaying (like a pact with a good outsider) this should be a very good alternative for healing sorcerers.
As for wizards, I guess it shoud be discussed where does the healing come from: if it is divine life energy OR just super-fast enhanced metabolism.
1. The first should be something similar to opening up a portal to a healing attuned plane (if you can summon a celestial hawk, why not?) but unlike divine casters, the wizard has to force his way in. How about a spell with alignment restrictions and a full round action to draw a magic circle on the floor (the focus) so any one creature standing on it would receive some healing as per cure spell cast by the wizard? (I'm wondering if increasing spell level is necessary... CLW as a 2nd+ level with the focus restriction seems to much for me... perhaps the bard progression would work)
2. I think the latter source is a little like polymorph, but that spells has a lot more effects than simple plain healing, so arcane cures should start a spell level lower than that, since it´s much more specific. I like the option of turning lethal into non lethal damage, but why not make arcane healing something as "fast healing"? Speeding up your comrades metabolism would effectively heal them after battle, but the healing edge would remain with divine casters (and their immediate cure spells).