it is not a dot command
I do believe it is
Ctrl S to toggle the squad color / tuned vox color ( channel 5 ) on or off ( least it used to be that way )
also, you can go in ingame or offline and clickon the clipboard, click options/preferences/ GUI ( I think GUI ? ) and then change the colors of the icons for friendly, enemy, wingman, squad, mission, etc...
hope this helps
TC