Here it is: on another server
there was this wondrously implemented tracking system, which really gave some boons to trackers, rangers.
When a character entered a map transition it left behind some track. The tracks eventually cumulated, and after some time the old ones vanished. So one could determine who entered the area in the past 1-5 hours, could determine the approx race, weight (so armor) and that the character was entering or leaving the area.
Considering that it's pretty hard to tail someone as a sneaker, since most people just switch to run mode when none looking, and you are stuck in the walk enforced sneak mode quickly loosing your prey, even the most accomplished tracker looses it's target within a minute.
Something like this would really add to the ranger class (yes, I'm biased), probably the result can be modified by the search/spot whatever skills, and would give some to the atmosphere. (you can check if someone entered the dungeon recently, hey maybe you can even check what kind of creature took up dwelling in the cave, examining the track mark outside)
What do you think?