the no key buisiness is just an error on some maps regarding atmosphere, i think bastogne and foy have it. it wasnt there prior to tov, its probebly okay to select and use, probebly just sets atmosphere to day time or such like.
as for stug versus sheman issue from previous posts, as i remember it was a balancing issue, the stug, unless it had veterancy, would generally lose against a 76mm sherman, i think because the sheman cost 60 fuel and the stugg 40, stug being an early game rush unit. and i too remember playing 2v2 and having to fight off 3 king tigers, while covering my side of the map. thank heaven for airborne trenches with 2 at squads in, & 76mm at guns , plus heat rounds from the entrenched howitzer