Nonlinear Finite Element Analysis

1- It would be greate and addition to have nonlinear materials such as Von Mises, Mohr Coulumb, Drucker Prager, Hardening soil, Cam Clay, and modified cam clay, concrete damage, and many other plasticity models which are very useful for Civil Engineering. 

2- Also, Contact mechanics. you already have code for collision detection. a good applicaiton of such funcitons is  contact mechanics where when two FEM meshes touch, the force of the collision is calculated and applied on the two bodies, then each body is analyzed for internal stresses. of course such applicaiton would require the support of large deformation Finite element analysis capabilities.


A particle physics engine would help in 2.