You can thank the makers of Storm of Zehir for the original fly-away effect, although I don't think it was ever implemented in the game. I simply added flapping and cawing sounds to it, and figured out the trigger scripting.
I always liked the flocks of birds in The Witcher that scattered when you came near. Those returned to the ground after a while though. If I could be bothered, I could probably give the raven trigger a heartbeat script that respawns the effects after a certain amount of time (preferably when players are no longer in the area). The fly-away script would have to store each original raven effect and its location so the HB script could eventually restore them. That'd be some tricky scripting (but not impossible).
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I always liked the flocks of birds in The Witcher that scattered when you came near. Those returned to the ground after a while though. If I could be bothered, I could probably give the raven trigger a heartbeat script that respawns the effects after a certain amount of time (preferably when players are no longer in the area). The fly-away script would have to store each original raven effect and its location so the HB script could eventually restore them. That'd be some tricky scripting (but not impossible).