I am not sure if this is even possible, but to explain I need to tell you first how I manage my files on the iPad. My main collection is on my computer where I keep them neat and clean and then, when I want to read some of them I select about 30 or 40 CBRs simply by the look of their cover and bulk upload them to the iPad where they remain until I have read them. Afterwards I simply delete them from my device to save space. However, with this methode I often select Titles I have read in the past and only notice that after I’ve spent some time reading them again.
If there would be a textfile or something under the hood that simply contains the title of the Files that have been finished so a flag could be attached to the file even if it has been deleted from the device and later reuploaded. Maybe even the date when it was last read or a history of the file.
As I said I don’t know if that is a desireable feature for anyone except me, just an Idea.