@Albus You pay the hosting bill, change it however you like. That's what I did anyway, I went from this:
But I made them slightly happier by adding the lightbulb icon below the page width changing button. So they weren't too shocked,
Yes, @teh_g is correct, global moderators are special in that they will always have moderate privilege outside of the privileges page. Unfortunately it doesn't look as though you will be able to restrict gmods from their moderation privileges for this forum -- it's quite an odd use case!