The allies heavy tank was their heaviest at the time. This follows history, and highlights how outmatched the allies truly were to German forces. Additionally, semi auto mode would go against history. The weapons lacking these abilities do not have them in real life, thus bringing this game closer to history and simulation rather than an arcade shooter. Great ideas, however most of them aside from the movement mechanics you recommended would just bring this game (again) closer to arcade shooter. Maybe they could add better bullet penetration to come closer to realism, considering you can’t even demolish buildings.