Allow Mai Columns custom columns to inherit

[JiveDig]

I'm not sure how this would word best, but I find myself wanting to recreate the same layout on each screen size, and it's tedious to set 1/3, 2/3 or Auto, Fill Space for multiple screen sizes. It would be nice if there was an "Inherit" setting that uses the size set in Desktop, or the tab prior, or similar.

I wonder if there should be 2, Inherit from smaller or inherit from larger screen or something like that.