Those of you who are okay with zinio--
-Do you consider yourself a slow or fast reader? This is not an implied insult, I think slower readers probably get better info absorption than people like me who skim or read very fast. However I bet slower readers are more willing to put up with long loading times. Which brings us to:
-How long does it take your app to render a page so it is readable? Does it have to re-render EVERY page, even if you flip backwards?
I do not feel this is a matter of 'right' or 'wrong', if you're willing to put up with the apps' shortcomings (or they are not shortcomings to you), more power to you. I'm curious, though, what makes the experience tolerable for some, but not others.
I bet you could already do this after a fashion, although perhaps not within Zinio. Depends on if the power-home button screenshot trick works within the Zinio app; after that it would just be a matter of a scrapbook or bulletin board app.