1. Use names like 01, 02, etc. This is the standard used in cbz files for many years. Changing it to do "human" sorting will likely break other files.
2. The viewer does not changes aspect ratio of images in any mode, unless the image is specified in a way that allows the aspect ratio to be changed, or is a cover image.
3. Look in the viewer preferences.
4. Hold down the control key while clicking.
5.
http://manual.calibre-ebook.com/faq....specific-order