Allow multiple entries before clicking "add to pile" button
When adding singletons you have to go through the whole process for every book. Search for the book, click the book, choose "add to collection", wait for pile page to load, make selections on pile page, choose "add to pile". Would be nice to be able to search for each one and choose "add to collection", then go and add them all to the pile at once. Not a huge deal but seems like it would be more convenient for singles where you aren't adding a large number of one title at a time.
It does allow you to enter multiple issues, annuals, specials, etc for a specific title. You can enter all the issues and then add all to your collection. If you want to add multiple titles at one button push, that would be very difficult and confusing to do.