I'd really like to see the park make a conscious effort to re-open The Haunting this season, not having it open last year was a big loss to me, but I totally understand why it wasn't possible.
I feel they could do this by taking four "bubbles" at a time, maybe six depending on bubble size. Have the riders stand on a designated numbered spot, all separated into different corners of the pre-show room. They could then have the corridor as a walk through, with the effect being activated as riders walk beneath, there is no need to stop. In the Library, the numbered spots could be used to get the riders to stand on their number in the different corners of the room, and run the Library without floor motion if that is possible. In the ride, use the numbered spots again to allocate different corners of the room, with the fifth or sixth group sitting in the middle of the inner rows.
I've also seen that The Haunting has ventilation, you can see the vents in the pre-show room and also the corridor.