Digital Comics Reporting

I really like that ComicBase makes it easy to add digital copies of comics, but there seems to be nowhere where I can identify whether or not any given issue has been added digitally or not. Besides just looking at the issue listing itself. They don't show up on any of the reports, and it cannot even be included as a field in the Export function. The only option I can think of would be to use one of the custom fields, and mark that separately to designate whether or not a digital copy is available.

I should think it would be useful to have an option to include/exclude digital copies in any given report. Maybe a user wants to see what issues they have to read of a title irrespective of format. Maybe they don't want to spend a lot of money on some comic series from the '40s, but want a list of what to track down digital copies of. I'm sure there any number of reasons people might have for having that as a searchable field.