Originally Posted by electronicfur
Mantano does that, and I use the feature a lot when reading PDF magazines on my phone. Its a lot easier than having to pinch zoom and get the zoom level right manually.
Use Mantano for PDFs and Moon+ for Mobi. Calibre Companion will allow you to put those files automatically into different folders or leave them in any one folder you want and associate PDFs so they are opened by Montano and Mobis so the are opened by Moon+. Then use Calibre Companion to select and open the books.