I too would love such a mod.
But the pace has to be slower to make it work. Stalingrad was not fought in hours, it took a lot more than that.
Make NCOs/Officers a precious, tide changing asset, so the snipers on both sides can actually do what they do best.
Probably moveable static MGs would be a nice touch, that way there could be the MG42, without an unlock. Or make an MG team, one alone can not use it (MG42 gunner, ammo bearer, tripod bearer, same with the Maxim MG, no tripod needed because many Maxims had wheels).
Get rid of the scoped G41, there was no such thing. The 1.5x scope was replaced by snipers because of its insufficient maginification. It should either be the first scope for a sniper being replaced by the Zielvier and later Zielsechs, or scrap the 1.5x completely.
Add more weapon related stuff, like barrel mirage (like the MG, without the smoke but blurred vision above the barrel), add jams to the guns to reflect cold weather jamming with the well used K98k/MP40 (jam chance reduces with better condition of the rifle)
add the knife as a weapon, it was well used in WW2 by both sides (if you don't want e-tools to make an appearance), either mounted as a bayonet or as a seperate weapon.
get rid of the squad leader spawn, there should be some kind of resupply point he has to move to to make his squad rejoin
get rid of all death messages, distance- and friendly indicators...the map has to go aswell, only NCOs and Officers had proper maps.
Make the map an item, if you look on the map, you hold it in your hands
Well, that's all I can come up with at the moment.