IL-2 sturmovik 1946 can handle 4 separate Game Controllers. If you have more than 5 attached (physically or virtually; check in Windows, Settings, "USB-Gamecontrollers") it's a lottery which 4 of them are used and no, there's no known way of configuring that -except detaching the ones not to be used.
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Ceterum censeo the mixture axis should be supported in IL-2 1946' DeviceLink.
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