FOKKER DVII F - a new airplane in Rise Of Flight. This outstanding machine is equipped with a BMW engine and customized carburetor specially designed for high altitude fighting. It gives the FOKKER DVII F a sensible advantage. The carburetor is controlled by two levers: by the main throttle (like the other planes in the game) and by the altitude throttle. The altitude throttle gives the aircraft increased power at altitudes higher than 2000 meters, which makes it a real predator, fast and very deadly. You should observe operational regulations for the high-altitude engine while flying this aircraft. Aloft under 2000 meters, altitude throttle should be completely shut down. While climbing higher than 2000 meters you should open the altitude throttle for 1/3. The next mark is 3000 meters, altitude throttle should be opened to 2/3. After climbing higher than 4000 meters altitude throttle should be completely open, allowing the engine to realize all of its potential. Be careful, as opening the altitude throttle at lower altitudes leads to engine failure. Even though you don't hear any strange or unusual sounds, the engine is wearing out and can fail any time. This damage is permanent (unlike overcold or overheat for example). For altitude throttle management, we implemented new key combinations : "Right Alt +" and "Right Alt -".
I found this here.
Do all the planes have this control? Or just a few?
Do you guys use your joystick controls or do you use the quadrant or keyboard to map it?
Last question: Is it really essential?