Trading FoV for density would certainly be the correct choice for flight sim, not much value in peripheral vision while scanning horizon or instruments.

Do you spend much time zoomed in, losing the angular 1:1 mapping of the viewport? I did that a lot with a headtracker (makes you really strive for precision, I had a custom build of freetrack with generous per-pixel hystheresis), but under the headset zooming felt more wrong than expected.