I think he's asking for what CS and a few other games have: Server based stat tracking with built-in leader board functionality.
So, you join the server for the first time, and type /rank. You get back a message from the server "You are rank 232/235", meaning statistically only three people who have played there are worse than you (must have joined, died a few time, and quit in this scenario).
Sometimes it goes a step further and adds in a points system for ranking, allowing higher/lower ranked players than yourself to provide more or less points/rank alteration.
I'm not particularly interested in seeing it in KF, though.