Kinda
So you can do:
setColorTable(int colorID, string color);
However, this will not update the colorset used by clients currently in-game.
They will need to disconnect and rejoin for this change to take effect.
Actually, this function might be client sided only, in which case you need to try and find the servercmd where the client requests the color table and package that.
Edit: wtf why did you make a new thread