One of Us - Changelings and You

[Vitatroll]

It's actually an idea that's been brought up a couple times before. The consensus IIRC is that "it's a really neat concept" that "makes sense" but it wouldn't work well in practice.

Ghosts that can ghost about have meta knowledge. Ghosts that are forced to observe the ling, and forced to hear and observe only what the ling hears and observe, are effectively being punished for normal gameplay.