I wonder, why you think, AI isn't using aileron? They do it quite often and intensively... i.e. in evading maneuvers. And its also graphically modeled (animated).
My bet is, you just need to take a closer look.
Open QMB, set 'Pos' to '+' (advantage), play a few seconds and watch the AI in front of you, they probably will roll imidiatly - check ailerons. From your cockpit its hardly visible, but from closeup... well you will see.
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