@vliah There's a clickspot below the red "feather" label on the throttle quadrant to show/hide all the levers.
You have an interesting suggestion. I haven't heard anyone else complain about this, because I guess they must have dual lever inputs. Unfortunately, overriding hardware inputs is always a decision made very carefully as a developer, because the last thing I would want is someone jumping in the airplane for the first time and not being able to get their hardware propeller levers to work for some reason.
I'll think about if there is any other way to do this, though. Sometimes it takes few days, but I might come up with something when I least expect it. Thanks for the suggestion! I can definitely see how it would be helpful for some hardware.