Try 'F Mode' or 'F Lock.'
I'm not sure if 'F Mode' affects the Esc button, but it's worth a whirl. I know it'll set up secondary functions on the F1 through F12 just like the num lock on the numerical part of the keyboard.
Older Logitec keyboards would default to the secondary F functions.
Also make sure you Esc button hasn't been 'reassigned' in the IL2 control panel. It may be that you just need to reassign it.
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