I, too, would appreciate this. One thing that has bugged me is that when only 20 entries are showing and hit the 'Select' button to select them all, it only selects the 20 entries that are currently shown. I need to scroll to the bottom of the list in order to cache all of the papers using that label (or residing in a folder) before I can do anything to the whole batch.
Isn't there a cache on our computers that Chrome uses when running Paperpile? Wouldn't this make it easier to load as many entries as we'd like?