I don't believe their [AT_PEACE_WITH_NATURE] has an effect in fortress mode; a modded elven civ (basically pointy-eared dwarves entity-wise), I seem to get the normal job cancellations from elves fleeing wildlife. Large predators will still target and kill anything that strays too close. However, the modded civ has the elven ability to tame anything in range, so the elves will have the advantage of embarking with incredibly dangerous animals. Elves usually have access to at least one of the giant cats. They'll often get elephants and rhinos, and this is why I'm including a grazer fix with the mod.
An update on the mod: I have the heartwood workshop and item created. Currently, I'm trying to figure out how to make the reaction spit out logs; there are no examples to look at in the raws and the wiki is being less than helpful. (Damnit, Toady, just store the regular workshops there! It would make things so much easier.) After that, the reactions will be thrown together in short order and the mod will soon be playable. Of course, I'm adding a lot more, but the basic purpose is fulfilled after that.
EDIT: After a quick test, you can enable the mining and woodcutting labors despite elves not having them as permitted jobs in the entity. This is good. I'll have the mod up for testing shortly, and I will also be doing testing personally.
EDIT2: Another update: The heartwood shrine performs its task properly. Currently you can use arrows to build it; I need to find a way to require hearts specifically. I also need a way to set the speed at which a labor is done: I have literally hundreds of logs after about twenty seconds of wood generation.