First I would like to say that I liked it better before when the small thumbs could be clicked to larger format on the edit images pages. Now this has been changed in a way to create custom thumbnails. Perhaps this should be a seperate option/button.
I think so because I was editing all the titles on one page and clicked that button to have a quick look at what the animal on that image looked like. This means all the entries for titles and descriptions are lost if you don't save the page first.

Hm, good point. As a non ZP workaround you could just use the tab feature of modern browsers.