Something I really miss for Skanlite is to save a scan as pdf. Ideally even save a few scans into one pdf file, but saving as pdf would be a great additional feature already (I know about the workarounds e.g. with Okular, but that's a bit annoying in the long run).
I'm happy to say that the next Skanlite release will have single page PDF support, but most of all, there is now a dedicated multi-page document scanning application called Skanpage: https://apps.kde.org/skanpage/ https://invent.kde.org/utilities/skanpage check it out :) *** This bug has been marked as a duplicate of bug 299517 ***