- New image rescale between thumbnail and original (client)
- Batch to regenerate all thumbnails (server)
- Special criteria to search inside OCR-ed content (eg. full:uranium) (server)
- Special criteria to search on a specific time span (eg. at:2013-06) (server)
- Show help on special criterias (client)
- Disable Add/Edit button while uploading (client)

- Extract text from PDF for indexing, see PDFBox (server)
- Make thumbnail of the first page of PDF, see PDFBox (server)