There is a method that will turn smoothing on or off but I do not believe there is one to set the crease angle.

A solution would be to do it via a pose file in the format as below:-

Code:

<pre class="alt2" dir="ltr" style="border-right:1px inset;padding-right:6px;border-top:1px inset;padding-left:6px;padding-bottom:6px;margin:0px;border-left:1px inset;width:640px;padding-top:6px;border-bottom:1px inset;height:130px;text-align:left;">

 
{
    actor abdomen:1
    {
        creaseAngle 40
    }
}

You could write the script to prompt the user for a value then have it write the pose file and apply it.