Yes, what csThor said. Even assuming you could get your head out of the 109 cockpit sliding panel, would you want to try it? Hit a minor bump, and you'd decapitate yourself, or at best end up with severe bruises. It was there for ventilation, or possibly to enable you to get some forward view with an oiled-up windscreen.
Is it that important though? I'd rather fly an air combat simulator than a taxiing simulator...
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