turnrate och turn transition

Hi guys…
I´m having a small problem where to find settings for a problem…
I´ve posted a video to explain.
Please look at it and see if you can help me…

Thanx

darned… no audio…
What I need help with is the following.

When the character is facing in another direction and I press W to go forward the character transitions slowly and fine to the direction.
But when I press A, S, D and the character is facing another direction, he instantly snaps to the right direction… no transition there.
Where do I adjust this? What is it that makes the character slowly transition to the forward but not to the back ?