I did notice in the opening movie that the sheath is barely attached to his back and seems to attach in between his shoulder blades where the straps cross. so I don't get why no one has created a sheath mod yet. I've also noticed that on the Making of The Witcher that there are some actual gameplay scenes where it clearly shows 2 scabbords on his back and there seemed to be no problems with how they interacted with the movements. I don't know if these scenes were beta or what, but even the location and fight scene doesn't exist in either the original version or the EE version, ie Garalt running off of a balcony the ground below.