1. it'd be great to use a feature that mangapark uses, to be able to choose the page width so we can change it to window width (so the page is the width of the screen)
This is already implemented.
2. to include mangago & mangapark websites
3. an android version
4. to have a non- browser extension download that would work like the extension but not be limited by google chrome but be able to open the manga in whichever default browser we use. possible?
That would mean having a extension/addon for each browser, and anyone can start working on it, just go to the GitHub repository, fork it and submit a pull request.