I'm not sure it would be possible, but it would be nice if V-1 operations could be improved.
* The steam cloud that accompanies a V-1 ground launch should be bigger.
* The jet flame effect should be bigger (see beginning of the video), and should be yellow (as described by observers) rather than blue. This is important for night interception missions. The smoke trail from the engine shouldn't be so obvious.
* The mission builder should have the option of setting the V-1's cruise altitude and speed. (Originally, V-1 cruise altitude was to have been 2750 m, but to improve reliability, operational V-1 were initially set to cruise at about 1,200 m. Later V-1 were set to cruise at between 600-900 m to better avoid radar and fighters. Maximum speed was 645 km/h, but this could be reduced to extend range. Typical cruising speed was 550 km/h. I haven't yet been able to find a stall speed.)
* If anyone feels inspired to model the He-111H-22, air-launched V-1 should be a potential loadout! In 1944-45, these aircraft were used operationally by KG3 to launch V-1 at England from the North Sea. Typically, the bombers would fly at "wave top" heights (below 300 m) at night to evade radar, then briefly "pop up" to 3,000 m to launch missiles, then dive back down to the deck and fly home. They caused tremendous problems for the Mosquito night fighters sent against them, until a Wellington bomber was modified as the first ever AWACS plane.