Edit Area Design - Margin & Padding shows padding but no margins

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Hello, i've recently installed a dev site in order to get familiar with Concrete5.7 before i switch my sites completely over. My problem arises when i go to edit an Area as opposed to a Block...
In block, when i click "Design & Custom template" i find a toolbar with the ability to set a margin & padding for my block section.
Ok perfect, but when i hover over the Main area and click 'edit area design' i find the same toolbar - except this time no margin options are displayed under 'Margin & Padding'. I was wondering if this was a bug or maybe an oversight? It seems unlikely so is there a reason for excluding this feature from the area styles? And if we wanted to add this functionality is that possible?