Why would you want to use the calibre editor as a wrapper to do something that is better done using, say, `unzip` and `sed`?
Assuming you are somewhat masochistic you can also
do it with vim.
vim does support opening ZIP files, and EPUB is a rebadged ZIP, so... here's what Kovid Goyal did before he wrote the editor:
ePub and vim
Given that there are far better solutions for scripted editing of files, I doubt any equivalent functions will be added to ebook-edit.