Is there any way to add a small line just above the ranging in this usersight? (red line is a poor mockup)

You would need to make your own. Or figure how to edit them.

ok, thanks mate

You can add it. Im not sure what “school” of sight making was used in creating this, but you should be able to freely add a line, color might be harder. l have never seen multi color sight, and i failed to do any.