I think the biggest thing I would like to see would be perspectives from the ghost/spirit side of things... I know this is impossible for us to do while we're still flesh & blood, however I think most of us that have had experiences or been exposed to the paranormal side of things could say there's a few safe points. I know there have been movies like Ghost and Sixth Sense, but to me those were hokey and half-assed attempts.
I would like to see different aspects of those things. The malevolent spirits who cling to the past, and as such continue to haunt locations or people... Those who are frightened of the situation and are trying to reach out for help... Those who don't even know they've passed... Those who pop in from time to time to check in on family and friends, or even take it a step further and dip into the realm of spirit guides/guardian angels...
I know what it's like on this side of the fence. I want to see how people would interpret the other side as well. How would someone write a script regarding a haunting, or a possession, from the perspective of the spirit? Would it be something where the focus is on the spirit, brief flashbacks to when they were alive, and then present-day, where the house they lived in is getting changed and it pisses them off? Perhaps it's an ancestral type of thing, where the spirit decides to be a burden to the family of someone it was involved with for no other reason than spite.
Perhaps the huge hurdle to crossing over is similar to the Catholic ideal that you shouldn't take communion if you do not meet certain requirements... Perhaps it's the same with the spirit world, where you cannot cross over until you've made peace, and some are just too damn stubborn to do so.