What no siren????

Stukas were sporadically using sirens into 1943, depending on the unit. They could by turned on/off by disengaging/engaging a cable operated band brake. There were at least a few pilots/gunners who rather disliked the sirens and who, though their aircraft may have been required (by the CO) to carry one or both of them, may not have actually remembered to release the brake(s) during attacks.

[FG28_Kodiak]

At early Ju87 there was no way to disable the siren, but many Pilots are nerved by it, so in the Ju87B2 it was possible to turn it on and off by the pilot.

Source: Motorbuch - Verlag: Das waren die deutschen Stuka-Asse 1939-1945

[JG53Frankyboy]

So, if 1C is deciding to let the sirens on the CoD Ju87 Modell ans will make them sceam -
They would also have to model someting in the cockpit and ad a toggle command in the keyptions