"Sticky" main column

The introduction of the "Sticky" sidebar was greatly appreciated. It helps in a myriad of ways. One of them being that it helped to balance the page when the sidebar was not as long as the main column.

Conversely, it would be nice if there was the option for the same condition of the main column. Sometimes it is desirable for the sidebar to be longer than the main column and when one has this condition, it would help the balance of the page if the main column was able to be "sticky."

Thank you for your consideration.