I have some wishes that may be somewhat "simpler" to incorporate into the game.

Airfield attack: a successful attack will disable the airfield from sending planes for a few days.

Railyard or Factory attack (or successful straffing of convoys): a newpaper article overexaggerating the devastation and destruction of the railyard/factory and how supplies to the troops/cities/airfields will get delayed.

Balloon busting: downed balloon will disappear for the next couple of days and then return.

Not so simple:

Depending on the type of plane, let the lighter ones carrying bombs feel heavier and kindda sluggish, then go back to normal once the load is dropped.

Takeoff and landing on snow or ice covered airfields causes slipping and sliding.

Show mechanics/Fitters/Riggers working on planes that were damaged in the previous mission. Also, show the damaged plane.

Leave plane wreakage visible for a couple of days with soldiers/trucks at the scene of the crash.

Ships and submarines. Also, ports in costal areas of Flanders.