For including pages/domains in the Google Disavow Links export file you will need to tick the box in the "Disavow" column in the table.
You can even choose if you want to disavow the page or domain. Every ticked page/domain will be included in the export as displayed.
Please keep in mind that we use very common spam link rules to identify bad links, but can still be wrong in certain edge cases. Make sure you review all links you want Google to ignore, because if you ignore good links, it might hurt your sites rankings.
In addition, we're already working on improved export functions for the disavow tool and any suggestion on how we can improve that is really welcome.