From Wiki:
Quote:
It is identified as the digitus impudicus (impudent finger) in Ancient Roman writings and reference is made to using the finger in ancient Greek comedy to insult another person. The widespread usage of the finger in many cultures is likely due to the geographical influence of the Roman Empire and Greco-Roman civilization.
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So yeah, the finger was around at the time
However, I don't think we'd see a British and a German guy exchanging fingers just like that in mid-1940.
But maybe some respectful gestures (such as a salute) could come in handy.
I think it's not something hard to implement, anyway. For instance, we have this sort of stuff in Rise of Flight already, so why not?
(It seems that other games are becoming an excuse for us to ask for minor stuff that add for immersion. Well, we'd actually ask for it sooner or later, anyway

)