Perhaps you could post some links to describing the effect, or better yet, distill them to a few equations?

HSpice's dependent sources allow fairly arbitrary expressions, you just have to reduce the physics to "through" and "across" variables (through=current, across=voltage). Verilog-A (the modeling language) has a natural way of setting up these equivalences, but if you can keep things straight in your head, you should be able to work with standard HSpice.