Regarding TYPO3 CMS Feature #60907:
To manipulate Websites I use this Chrome Extension: User JavaScript and CSS
To have a "edit all"-Button I use the following script on the TYPO3-Domain, with an additional bookmarklet to call _editAllMetaData
.
To create a bookmarklet make a fresh bookmark in you bookmark bar, edit it, name it "edit all" and fill this into the URL: "javascript:(window._editAllMetaData());"
It inserts a button in the file table's header or, if not present, it appends it to the search form.