Import of JabRef preferences (via Tools and Settings > Reference Preferences (JabRef) > Import preferences) does not work since jabref stores the values in the original place ([HKEY_CURRENT_USER\Software\JavaSoft\Prefs\net\sf\jabref]) of the windows registry, but docear uses another location ([HKEY_CURRENT_USER\Software\JavaSoft\Prefs\org\docear\plugin\bibtex\jabref]). Please fix that.
http://www.docear.org/support/forums/docear-support-forums-group3/bug-reports-forum6/imort-of-jabref-preferences-not-working-thread993/