It is pretty difficult to tell the difference between some of the colors,
Fremen & Mercenaries for example.
It would be good if like other modern games you could toggle into a friend/foe mode
which colors you as blue, allies as yellow
and all enemies as red for example.
Fremen and Mercenaries had the same colors in the original game albeit mercenaries were never used; but they can be seen in SuperDune. Maybe the color could be changed to be easier to distinguish.
IMHO, making all friends blue/yellow and all enemies red would completely change the feeling of the game. Is it really necessary to make the game that easy?
Fremen should stay the color that they are now (since they were used in the original game), but changing the color of Mercenaries would be quite helpful for custom games where one could have both Mercenaries and Fremen in the same map (and where one of the two could be yours/friendly while the others are hostile).