Thanks for an amazing app that supports Zotero. I have some feature requests that I think isn't to much to expect from an app like PaperShip.
The search needs ways to filter results. One such filter would be "search only in this collection". Right now searches just goes through the entire library, with no way to filter the results. this quickly becomes a problem if you have a lot of papers have similar keywords or tags. Similarly one should be able to search only within specific fields such as publication, tags or keywords. For example I use the tags !read and #read to find out if I've read a text or not. In general I would like more options for filtering and searching.
If any of these requests are already available then I'm sorry, but I haven't been able to find them :)