It's not really a game-breaking skill, rangers still need to avoid civilized for so many other reasons, and it's Christmas.

Change the name to reflexes of the hunter or somesuch, but still make it work dependent on wild time: the ranger is learning how to move and fight from the beasts and willow tress and whatever, instead of just knowing his way around the woods. Let's be serious, the wilderness is way more dangerous than cities, in CF and in reality, so why should rangers basically lose their basic survival instincts when their feet hit cobblestones?