Seems that you dont know this game.
Just (like in il-2'46) change in conf.ini: SpawnHumans=0 to
SapwnHumans=1.
And no, no MOD is required to see this, is in "vanila".
Like in il-2'46 cost some FPS, and dont expect people walking around (as wandering in BoS), but are a soldier riding a bicycle, driving a tractor and in vehicles - if set in FMB - these are possible "kill".
To see cows, sheeps and seagulls (no colision mode) is need add then in FMB, and in "vanilla" the cows are "fifth columns", so British guns fire in then.
With TF patchs the cows became more patriote, and just walk (better say, skiing) around.
Sokol1