It depends on what is in the task force and why you want it disabled. It is possible to stop the AI from using certain units and thus any taskforces that contain that unit by either changing its required houses or by changing its tech level to 11.
I think he wants the AI to use a specific taskforce that he creates himself.
Yes, it is possible. Just do what you normally would for the AI file. Make your [TaskForce], [Script], etc. The AI will use it only in that mode. Just make sure you add the stuff to the lists in the GAME MODE file.
That doesn't work though, the mode .ini files is for rules.ini overrides, not AI additions. You would ned to create specific maps that included the extra AI stuff and that only your new game mode would play.
Game mode AIs
