IDEA: Add a settings option for color-blind players to easily distinguish between green and yellow, and blue and purple colour schemes used for players and map territories.
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Red-green colourblind here chiming in. This is a deal breaker for me. An option for 6 player-defined team colours is the way to go.
A decent short term partial solution would be to make the 4th, 5th, and 6th armies Purple, Green, and Orange (In that order). Orange, Red, and Green are all very similar for red-green color-blindness (the most common). The colors that you chose for yellow and green are identical.