My opinion is yes, this would be nice.
I would limit it like the fireworks, maybe once per round though. You don't want to encourage rushers.
I don't think the survivor should get any points, or if they do, it is offset by the cost of the unpin.
If we do this, it should be for all the pinnable infected (hunter, charger, jockey and smoker)
Great idea. Mix things up a little.