Share 'Collisions in Kangaroo Physics'

Hi there, I have been looking to see if it was possible to make simple collisions with Kangaroo Physics. Like in this video http://vimeo.com/15563685 I want to be able to attach different sized closed splines to a moveable point and have the splines not merge into one, this is all in 2D, Plan. Any ideas of how to achieve this?  Thanks a lot Matthew