Rhikter said:
Under what sort of curcumstances would additional/altered JerJerrod dialogue be needed in RotJ?

There have already been suggestions of reconstructing deleted or unfilmed concepts like the Vader choke scene, the scorched Endor move (where Palpatine orders him to destroy the moon if the shield is shut down) etc.

And even to have him target the Executor to try to shoot it down before it can impact on the station.

It may be possible to create more off screen presence for the character if appropriate dialogue can be found elsewhere.