Wastrel - I see in the first post of this thread that, like me, you're interested in A.I. Did either of your FSM or behaviour tree plugins mentioned there ever come to fruition? I'd be interested to know what functionality your FSM behaviour provides that differs from, say, using an instance variable to record an object's current state, and a set of conditional events to handle transitions to other states.
I have my own existing Javascript implementations of Genetic Algorithms and Artificial Neural Networks that I'm considering wrapping into plugins. The problem is that, in order to be useful, they both require a reasonable amount of scenario-specific customisation that is easier to achieve at the code level rather than via C2's GUI. I'm therefore dubious of the value of providing them as plugins, since it would only really be useful to people who were happy to dabble with the code....