Hi,
Since Box2D has no direct support for springs and torsional springs,
Mekanimo cannot export springs, torsional springs, gaps, and chains.
There is a way to modify the distance joints so that they behave like
springs, please see
http://groups.google.com/group/mekanimo/browse_thread/thread/4d1e5f663a93f1bb
for more details.
Everything else is exported in the header file for either version 2.01
or 2.02. Soon, I will add support for version 2.1 as well.
Fahri