I generally fly the 172 but I’ve tried this with several aircraft that have variable interior lighting knobs and all are effected.
In Options > Controls > Lights > Interior Lights. There is several options for each interior light (Panel, Radios, Glareshield, and Pedestal). Take Panel for example. There is options to assign a key/button for “Panel Lights On”, “Panel Lights Off”, and “Set Panel Lights”. There is also Bindings for “Increase Light Potentiometer” and Decrease Light Potentiometer”.
I have tried different combinations of bindings and key presses to get these functions to work. If you use the mouse to turn on the light; then you can use the “ON” and “OFF” key binds to turn it on and off at the level of brightness that you set with the mouse. But the “SET” and “POTENTIOMETER” do nothing. So it is not possible to adjust any of the interior lights with the provided key bind options.
Hope to see this oversight corrected.
John