I'm currently working with Oblivion machinima and I have created few animations for it. From time to time I come across one problem, the npc character's head and neck rotation. It seems that engine itself alters characters' head and neck rotations. Most of the time this isn't a big deal, but few custom animations looks terrible or at least strange, when characters don't rotate their heads according to the animation.

I have tried to fix this by setting the animated character to look at himself/herself, but still the engine waters down some of the neck and head rotation.

Is there some way to prevent engine from altering animations or is this feature hard-coded and can't be altered?