@hoba:
Already implemented in the HEAD version (developement version of next major release). For now use hidden config.xml option (see http://faq.pfsense.com/index.php?action=artikel&cat=10&id=38&artlang=en&highlight=hidden ).
Following the link from FAQ:
Error: Unexpected output from cvs co:
cvs checkout: cannot open /cvsroot/pfSense/conf.default/config.xml,v: Permission denied
cvs checkout: could not read RCS file for pfSense/conf.default/config.xml
(expected "pfSense/conf.default/config.xml" but got "")