At present, there is no way to disable unit head movement during animations. Dev animator, Smookie, comments on this here: http://forums.bistudio.com/showthread.php?177500-Animation-explanation-of-the-magic-behind/page5. Be wonderful if we could get something like _x disableHead Boolean.
This would allow for greater immersion (unit looks at player during cutscenes) and would help prevent several animation anomalies.
Thanks chaps!