I don't do many variations of squat haha, basically stick to back and front. But for the purposes of information... These are movements I could see being done as "max effort squat" movement
-box squat to paralell
-low box squat
-squat from pins
-high bar, close stance squat OR low bar, wide stance squat (whichever isn't the style you use. or both haha)
-safety bar squat
Heavy 5/4/3 Good Morning
Just like bench and deadlift, you can change your squat ROM by putting the bar on pins, or raising/lowering the box you use. Also, just like moving your hands out on bench, you can move your feet in/out on squat. multiply those 8 max effort movements by the differrent rep-maxes, and there are 40 different ME workouts for you, plus 3 good morning ME days for good measure haha.