The thing is, Snafu, that you do not aim with one eye (no pilot would ever close one eye) but you have both eyes open (there had been a video clip somewhere posted here that explains why it is actually better not to close the other eye when shooting with a rifle). If a pilot really would have closed one eye he would have lost all in-depth perception and it would have made it very difficult to judge distances. He then would have had a 2D vision in a 3D world.

I do believe that putting the revi slightly off-centre in German planes was not to make pilots lean right (why should they? It would have complicated the task of the fighter pilot). It simply did not matter to the pilot if it had been in the centre or right before his right eye.

I understand what you say about simulating the difficulty to have a steady aim.

However I also think that the difficulty is artificially higher in a 109 currently than in a Spit because of the way trackir works. But I think we both agree that the difficulty should be the same for both planes. BTW if simulated correctly in the game the binocular view of the recticle it would still disappear at least partially if your head shaking is too strong. This would occur when the right eye due to head movement does no longer see the full circle. This would of course have an immediate impact on the image the pilot gets.

I concede that Lixma's image is perhaps not the most ideal solution to this issue but one that comes perhaps the closest from what has been proposed. But I am open to any other proposal that might be better.

EDIT: Of course it would also still wobble due to head shaking. So you would still need to correct your head position (keeping in mind that due to trackir it is - supposing that the headshake is correctly modelled- more difficult to correct head shake than in real life due to the "gear ratio" between your head position and how it is then depicted on the screen)