She was initially going to sacrifice herself "for him" and with a few choice words Quirrell got her to attack him.

Ah, I see. You and I agree, then, that in canon, Rowling intended us to believe that it was the defenselessness of Lily's sacrifice that protected Harry. That if the scene had gone in canon as it does in MoR, with Lily trying to curse Voldemort, that the protection would not have activated.

But we disagree as to the reason for the differences Eliezer introduced. You think that the universe is the same, and that Voldemort explicitly tried to counteract the Love Shield. But I find, and given what we know of Eliezer's values I think that he would really find, that Rowling's implication — that Lily's defending herself would somehow cheapen her defense of Harry — is morally repugnant. Therefore, I believe that the rules in MoR's universe are likely different from canon's.

I think the more likely reason for the difference is not to show that Voldemort was clever enough to dodge canon!shield, but rather to indicate the nature of MoR!shield. Assuming that Voldemort actually did cast the Killing Curse at Harry, and that it actually did rebound and blow Voldemort out of his body, I think what happened — or at least what we're supposed to believe right now — is that Voldemort unwittingly entered into a magically binding agreement when he taunted Lily. He was amusing himself with his cruelty, but his words were his downfall.