Is it possible to search my libraries for a symbol by entering the known content of a custom field?
Example:
My symbol PRT2233 has a custom field DB_KEY with the content un1k3y. Can I configure the library browser to show me symbol PRT2233 when I search for un1k3y?
I have not checked if Eeschema searches through custom fields, but the libraries are plain ascii, so if all else fails you can still use grep or a text editor that can search through directories.