Not true. Keeping it in but making the head model turn according to it's use, and limiting it to approx 90 degrees left and right makes sense.
This is a good idea, but sadly I don't see a separated head movement being modded into the game. This is fiddling with things that are hardly modifiable.
In real life, I can run in one direction while looking in a different one. Leave it.
Heh... you should maybe double check this. I'm not even asking for you to look back. Just try to run fast and straight while looking 80 degrees to your right or left. Have fun.
It just "works" as it is now. Not realistic, but not really a problem either.