Another implementation I am hoping to have it each nations buildings (mainly castles, towers/keeps etc.) with feature the nations flag and colour on top. And where possible on units also have the nations coat of arms on them, either on a shield, clothing etc. even if it is just visible it makes units more distinguishable and realistic, for example:
or
Would appear on Englands men at arms shields, as in the first in-game pic.
Added (07/October/2010, 12:02 PM)
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Also do we all agree that each nations unique unit takes the longest and most expensive to build? In reality, the longbowman for example took years and years to master and were also the only practise allowed to train on Sundays on the traditional religious rest day.
What are peoples thoughts?