my idea is real simple. the train stops in the middle, all the lights focus on it, and the engineer lets loose with the whistle and a steam show. then all the lights go out so guests can see the orange glow of the firebox and all sound should be stopped so the chuff chuff bass of the engine getting under way can be heard. then santa can stand on the last coach and wave to guests.
That's a nice idea in concept but after having recently just come back from visiting the Magic Kingdom where they have compromised the daily operation of the WDWRR due to shows (fireworks and the park opening show) I would hate to see the DRR affected in any way by performances in the park.
Please, leave actors and the entertainers far, far away from the trains.