Show two copies of same menu
How do I have multiple copies of same menu, but with different disable options for each


Drupal doesn't support anything like that, and I must admit it doesn't make sense to me that it would. 

As soon as you have two menus that need to show different things, you need two menus. Setting arbitrary rules on how that second menu should partially sync itself with another, arbitrary, menu, is a conceptual nightmare. I can't even imagine what the UI would look like for that.