Is there a way to generate the cache offline? Lets say, the gallery has several albums with several photos. Do I have to view each single albums and each single photos in order to generate its thumbnail in the cache? An script generating the thumbnails offline might be nice.
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If you modify i.php, you could add a flag that makes it not load the actual image in the browser so that's faster.
Other options are to use a batch image resizing program, and use the naming scheme that ZP uses. They're named like:
[folder name]_[file name]_[size].jpg
ex: Desktop Pictures_Dog and Cat.jpg_480.jpg
Then pop them in the cache/ folder.