It's a bad idea. The second I was revived I'd start crowbarring a wall to spell out a name. It'd take me like 10 seconds to give enough letters to say exactly who it was.
Also even better, when I was dead and in spec I might hear the names of the other traitors too! So not only would I spell out who killed me, but the other guys as well. So unless they can not talk, can not fire any kind of weapon, then maybe just maybe the concept would not be instantly exploitable, but what would be the point then if they can't do anything?
link=topic=9844.msg383486#msg383486 date=1276968610]
Again, I would just get up and kill the Traitor that killed me, and any Traitors that I noticed in spectator, if questioned post-round or after I die, I would just answer "I was revived from death, and saw who killed me".
Depending if the cause of death is recoverable, you could add a death timer that won't add the player to spectators until the timer goes off.
You could make it so it impairs your actions by a percentage IE Attacking only works half or 25% of the time after defib.