*Logging* There is /etc/conf.d/mythfrontend on Gentoo, which sets the syslog parameter. And one for backend. MYTHBACKEND_OPTS="--nologserver"
*Database* To delete unwanted hosts fro mythconverg data base
mysql> SELECT DISTINCT hostname
FROM settings
;
will show you the various hostnames/identifiers with settings.
mysql> DELETE FROM settings
WHERE hostname
= 'identifier';
will delete all settings for the machine using the chosen identifier.
*To update videos from the cli* mythutil --scanvideos