Obviously the best psychic ranger will be the psychic animal companion. Slightly more seriously, the psychic die could determine how many actions the AC could do on its own without being commanded each round (1= move, 2=move and a reaction, 3=move, a reaction, and an action, 4=move, a reaction, multiattack [2], etc.--I would limit this to d6). So if the BM's player wants the AC to attack, and only roles a 1, he/she has to use the BM's action, but if they roll a 4, then the BM is free to stab or shoot the enemy with his/her action.