This is why I have been advocating for years for a systemized, continuous study of a haunted area. It shouldn't be hard to find an area, a room someplace for example, that has paranormal happenings on a regular basis. Then set up cameras, recorders, and all the other equipment that is being currently used and do this for several weeks at a time or longer without stop. I do know the biggest difficulty would be that the tapes and recorders would have to be analyzed round the clock and it could be very difficult. But maybe it could be done.
One of the things that I have a problem with is that people go into a place already knowing it's haunted, supposedly. What I would like to see more of is people just being sent to a house selected at random not knowing whether or not it's considered to be haunted, and then see what they find. It would be very interesting to see if people come up with "evidence" at houses where there has been no recorded paranormal activity. The knife would certainly be seen to cut the cake with that kind of a control. If you were in a group that did that and you got evidence 100% of the time, then you'd know for sure you have some refining to do in how you were conducting paranormal searches.