Wow, thanks a lot! The plugin is perfect for me now (.bib file format would be a great surplus). I can now use the secondary quote command to enter [Cf. @{{citekey}}, ], which I use quite often.
Edit: One small addition would be nice: If there was an option to also create literature notes when entering citekeys in one of the pandoc formats. This way one could keep track of all the literature cited by looking into the literature note folder.
Edit 2: Before there was an information in the settings panel about how many references have been loaded from the source file. This does not appear anymore. Was this removed deliberately?