This "wish" is more about the infrastructure to actually interface with the game and develop the AI.
Sorry for the hijack.
I sorta get what you are saying. I've seen systems that allowed user scripting in Python or some proprietary scripting language to build custom AI behaviors.
I guess I would see that more as something that would be written into a mission at the mission design time in the Mission Editor to give AI decision tree behavior based on runtime variables instead of statically defined and compiled behavior based only on segment time duration.
Are you talking about trying to write behavior code realtime during gameplay? Have you tried making some AI missions with the editor?
Currently, in the MA the AI is limited to things like auto ack and bomber drones and such. So there would be limited applications. To some extent you could call a ranking player defining a task force path as a form of very high level AI scripting.
Perhaps you could give a concrete use-case example of what you would like to be able to do?