Bukkit

What is the enhancement in mind? How should it look and feel?

Currently The permissions for Eject At and Eject Here signs are the same. The issue is that while the Eject here signs allows a minimum amount of transportation to a very close location, the Eject At signs allows unlimited warping to anywhere on the current world.

It's completely reasonable for anyone to be allowed to teleport themselves a couple of blocks, to a place where they placed a sign themselves.
It's a whole different ballgame for anyone to be allowed to teleport themselves anywhere they want. The permissions should be split so the Eject Here can be allowed while the Eject At is disallowed.