I wouldnt use the ceilings if your planning on going to the werewolves...it will crash you every time and its a pain finding the ceiling files and delete them one by one...
Yes I can confirm this hak has probably quite a high potential to crash a module. It happens when you enter any caves area with a doorway or a door transition placed in any four corners of the tileset (or so I have heard this is the cause)
While I dont know this is true, I do know it crashes you, ive experianced it first hand. You may find entire areas of the module are no go areas. Ive stopped using this alltogether since.