Wilderness Lore currently includes: Survival in the wilderness, finding food (etc), reading the weather, keeping track of your compass direction, and tracking.
Then as per various discussions, elaborate on the tracking to include forensic analysis abilities.
I think that this skill is already one of the most important in the game for anything wilderness related, and definitely one of the strongest skills unless survival and tracking are irrelevant skills.
I suggest creating a Craft[primitive] skill that allows the creation of crude equipment out of simple materials- armor, weapons, traps, clay beads, etc. Finding the materials for this uses Wilderness Lore, Search, & Spot as appropriate, and usually by the character's with the skill (because after a short amount of time, PC's only do this when they are in a desperate situation with no way to get to safety.)