Retrieve Metadata from PDF
I understand that the "Retrieve Metadata from PDF" send automated requests to Google Scholar. Is it possible to add another database or change the database for the requests?
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The feature already searches other sources if a numeric identifier (doi/isbb) is found.
Which other sources are you thinking of?
That's not customizable without patching the software itself -- there are a couple of reasons for that, but most importantly Zotero needs the ability to search through the full text of articles and there are not many databases, not even disciplinary ones, that offer that for a large enough set of papers to make sense.
If you do want to patch, the good news is that the relevant code is all in a single file
https://github.com/zotero/zotero/blob/master/chrome/content/zotero/recognizePDF.js
I tested this PDF with Firefox 54.0.1 and Chrome 59.0.3071.115:
http://literatur.thuenen.de/digbib_extern/dn056163.pdf