every plane in CoD has a supercharger
(ok, the Moth most propably not ?!
)
but just few have to be shifted manually :
Ju88 (should have automatic !!)
Ju87 (actually should have an automatic setting and a low blower setting that would force the use of the low altitude setting at higher heights to increase range)
He111H
He111P (actually only showes the controles, but there is nothing to shift as its DB601 is automatic
)
thats it IIRC...