I was referring to Alliance chat not Global I realize GM's (devs) want their replies to stand out which could be accomplished by using a set color only available to devs. Color options can be set from a picking list and that color could simply be removed from user controls or tagged in a way that only makes it accessible to the devs.
The bigger issue is the background colors with everything in a monocromatic color scheme, in this case all shades of brown including the text in alliance chat. things tend to blur together and it can make it very difficult to see.
If players had the option to change their background setting (many forums and other chat sites) like you can on other sites it makes the game more user friendly and comfortable to play. After all no player who is made uncomfortable is going to stay with a game for long if it is actually causing physical discomfort to view the screens (my personal issue).