Options for the _unzipped_EPUB_ feature

I like the new feature to edit metadata introduced in 1.1.0 but would ideally would like to see some more options for it.

1. I think the production of the _unzipped_EPUB_ folder should be an option in settings rather than always happening.
2. I'd like to see an option to rezip the EPUB when the user has declared they have finished editing the metadata.
3. I'd like the _unzipped_EPUB_ folder to appear next to the EPUB not in the 'Internal Report Storage' location.
4. If the app is to continue to write these potentially large folders to the 'Internal Report Storage' location than I'd like an option to clear _unzipped_EPUB_ on quitting the app.