[@Halvtand]

Go crazy with the Senjutsu! I honestly think it's fine - at the same time, I think Space Time Jutsu and other such usually taboo techniques is perfectly fine, too. It just has to be utilized by someone who's at a level where it makes sense to know them.
If we had a character with a huge chakra pool and the shadow clone technique (Which, I think is teh most powerful jutsu in all of Naruto) they should be able to pick up advanced techniques much easier than everyone else, like Naruto did.

Though, Senjutsu itself isn't just something you figure out, you'd have to get taught from masters and the animals themselves, if I don't remember incorrectly.