tetrahedral elements with material properties

Hi all, hello world! My first post and I'm already obsessed with kangaroo. Anyway, I'm wondering if this capability still exists in kangaroo:

http://www.grasshopper3d.com/video/constant-strain-tetrahedral-elem...

I'm currently modeling sheets of springs and looking at applying forces between individual nodes (definition attached..) to generate curvatures, but the example above seems to have more rigorous material properties. 

cheers alex