Played 4-1-4-1 with red arrows for MR and ML. Normal, mixed, own half, normal, mixed, zonal, no counter, no off trap. Won 3-0 on 58-42 possession (13% possession bonus for me). The opp qual was overall 6.6 points lower than mine, but I played only with the subs.
I guess dv8r was right, 4-2DMC-3AML,AMC,AMR-1 is not an illegal formation.