Have you seen Pathfinding demo in Contruct 2?
If I understand this right this it what you looking for.
In the example when you click to Go to new position it Stops and go to the new ordered position. In this case the Order to Stop was a Click of mouse, but you can customize that for what you want.
<img src="smileys/smiley1.gif" border="0" align="middle" />