Filter issues by "reprinted"/"collected" status
It would be useful to filter issues by whether they can be read in a collected format (specifically, TP or HC). Currently, to answer the question "can I read this series in a collected format," the user has to click through every issue and scroll to the "Collected In" section. It would save time to be able to do this with a single click.
Also, if in the future collected editions were tagged with keywords like "Omnibus," "Epic Collection," etc. it would play well with this feature to show, at a glance, which issues have been collected by format. I'm not necessarily advocating for tags at present, but it's a way this feature could expand in functionality in the future.
I know this would be a redundant feature for many current series, since almost everything from Marvel and DC gets collected these days, but for indie titles and comics that are 20 years older and more, this feature would be much appreciated.