Region code enhancement setting

looking through the UI fro the latest version, I see an option to remove RCE which is set by default for region 1.
Am I right in thinking that RCE is currently only used in region 1 and so I should leave this setting as is,
or should I change it to region 2 because almost all of the DVDs that I buy are region 2 ?
i tried googling RCE & what I’ve read so far suggests that it’s only in use on some region 1 discs.