I suspect poltergeists are something that will have to be patched rather than modded. At least in my experience the problem seemed to be that the game forgot to save the changes I made after setting items down.
sorry if it isn't on topic but, i have encountered posts about you guys placing items in the world and i cant find the way to do it so can you enlighten me? All i can do so far is toss them in front of me with little or no control over where the items end up
But your cursor over an object (or corpse) you want to move and hold down the use/activate key. This will let you manipulate the item. It can be a bit cumbersome, particularly if you want to rotate something (I suggest finding a piece of furniture to press it against).