eBay Item Specifics 

These can easily be added to eBay listings.  Click on "Manage Attributes" from the eBay | Codisto menu in Magento Admin.

Here you can add item specifics and choose whether or not they are controlled by the Codisto grid ("Manage Listings" menu) or by attributes.

To choose which columns are viewable in the grid use the column chooser (to the right of the eBay button)