VR 'npc'

[robertGN]

person a: "move north if rickie basinger is a traitor, south if he's just a shmuck."

vr npc steps one tile north

^^^^^
this is what i would be afeared of. additionally, remove the ability for NPC people to hear what virtual people have to say, and i am on board with this suggestion

That would pretty much be metagaming. Plus, there are already a bunch of ways a ghost could communicate with a alive person in your scenario.

"Use the Ouija Board if John FuckYou is a traitor"
"Spin the chair if your mom is a changeling"

All that would require is a person to catch the attention of a relatively grumpy ghost.