Third Person Controller rotation limitation

I am using the Standard Assets Third Person Controller on Unity 3.4.

I use the Left, Right, Up and Down (or W, A, S, D key) to move. I notice that when I press the Right or Left key, it rotates 90 degrees.

Is it possible to rotate it in smaller angle (like 15 degree)?

Also, I notice that the mouse does not do anything. Is this expected behavior?

Thanks in advance for your help.