Why are so many people against this? I just read a dozen posts bashing OP's ideas and they are perfectly reasonable.
Because of how he reacts to people disagreeing with him. Srsly, if you have a kind of valid point, don't be a total ass about it or people are going to be an ass back at you!
As for Nature magic in Skyrim. As far as I'm concerned every magic is a blessing from the gods of some kind. They already added shouts as a blessing from Akatosh, so they didn't add more.
Also: Yes, it isn't in the lore, but it could be added to the lore of Valenwood quite nicely (me liki Bosmer). But, I don't think the druids of Valenwood would/could pass this magic on to just anyone as it would be a blessing of Kyne, which they would do, if you added a new school. So in my opinion it wouldn't fit the lore if any PC could do it. I mean the Spriggans already use a bit of nature magic, but how are people supposed to learn it?
Basically my point is: If they ever decide to make a TES: Valenwood (I so hope they do), it could be added quite nicely as a substitute for shouts. In Skyrim it wouldn't quite fit.