Thanks again for the feedback
I prefer to stick to Ebookdroid, as the pinch to zoom works well. However, I might try that KOReader patch.
Regarding Moon+ Pro, I couldn't find cropping for PDF files. However, with pinch to zoom I don't think you need it. You can zoom to the exact size you want. The only issue is contrast enhancement - with E-Ink it is necessary, as the text appears pale and difficult to read. Another nice option, would be the interface and menus being optimized for E-Ink; however, the current interface is legible.