Hmm. Haven't thought about that variant, and I must say, it sounds good. I'll propose this to the player.
after several pc's tried ranger and being "less than happy" then after reading this "favored terriian" varient, it was a slap to the forehead, what a great idea, makes since that the Ranger instead of focusing a hatred towards a race (racist!) he studies and knows all of a terrian, its what the Ranger should have been.