We now have ubireader_display_{block,info} and ubireader_extract_{files,images}, and ubireader_{list_files,utils_info}
where list_files does a bit more, it is responsible for displaying files and also unpacking them.
I personally suggest to integrate ubireader display_{block,info} and list into ubireader show block/files/info, extract_{files,images} and utils_info into subcommand form.