Problem with that is the Yak had a manual mixture setting. The pilot needed to always manually adjust the mixture according to aircraft configuration and altitude, and made for a high workload for the pilot. The +/-20 increments in the mixture settings used in the game is a simplified version of this.
According to which setting the pilot selected, the auto-mixture in the Corsair either automatically controlled the mixture at a rich setting, a lean setting, at full fuel flow, or stopped fuel flow at cutoff. The pilot did not need to constantly monitor and adjust fuel flow as the pilot in the Yak was required to do. With the Corsair and other Allied aircraft, I think the game just makes an expedient simplification by allowing the mixture settings to be set at either full-rich or an optimal lean mix setting; there is no separate rich or lean mixture setting or idle cutoff. This also means you must use the [I] key to shut down the engine, as opposed to moving the mixture lever to Idle-Cutoff to cut fuel flow.
In the in-game Yak however, you can cut fuel flow by moving the mixture setting back fully because it does not use the game's auto-mixture system.
"Fixing" this is probably more of a complicated issue than just considering the number of increments in fuel-flow settings, especially considering auto-mixture.
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