Start Animation gets Interrupted

Do you know how I can speed up my turn-in-place animation when my yaw of the camera is too much?

I want my player to always face forward and not have the camera be able to look behind him if the player spins the camera around the character too much. With the animation speeding up the character can always look forward!

and add
stand to crouch/crouch to stand
animations?

I have a problem blending these to and from idle.