Hopefully this will help speed the implementation of one.
After extensive testing with my Red/Green colour blind friend, I ended up modding another game World of Tanks with these colour codes for the Over Target Markers of allies and friends:
Ally: 96FF00
Enemy: 9900FF
Lance: 0000FF
or their decimal equivalent:
9895680
10027263
255
These colours provided adequate variation to determine if a target was an enemy or a friend.
Related topic.
Edited by Shinikake, 05 August 2015 - 11:27 PM.