Itween CRSpline to BezQuad

Hello, I'm making a game in college and I'm using ITween path (CRSpline), but need something more fluid, I saw that in ITween, Bob Berkebile used the code for CRSpline in this post written by Andeeee http://forum.unity3d.com/threads/32954-Waypoints-and-constant-variable-speed-problems?p=213942#post213942

Is there any way to implement the QuadBez inside ITween, or some other similar solution? :)

public class QuadBez {

public Vector3 st, en, ctrl;

 public QuadBez(Vector3 st, Vector3 en, Vector3 ctrl) {
     this.st = st;
     this.en = en;
     this.ctrl = ctrl;
 }
 
 
 public Vector3 Interp(float t) {
     float d = 1f - t;
     return d * d * st + 2f * d * t * ctrl + t * t * en;
 }
 
 
 public Vector3 Velocity(float t) {
     return (2f * st - 4f * ctrl + 2f * en) * t + 2f * ctrl - 2f * st;
 }