Unfortunately you can not mod which ruler is featured. And it would be tricky for us to add support for since it doesn't use the normal scripting system.
You can disable it by removing the "game\interface\highlighted_ruler.gui" file. The code checks for the existance of the GUI-windows used, so it shouldn't crash if they can't be found.
You can disable it by removing the "game\interface\highlighted_ruler.gui" file. The code checks for the existance of the GUI-windows used, so it shouldn't crash if they can't be found.