Okay flame me if this is the wrong area to be putting this in but....
Have we come far enough to make Hidden rooms like AKA You see a wall but you can walk through it and into a room like in James Bond or some other game that those are in
I dont think thats possible yet, but with one of the plugins for HMT3 you can turn off collision models or turn them on etch so you could walk through a scorpion tank.