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savedconfig
From Gentoo Wiki (test)
savedconfig is a USE flag that, in general, preserves the saved configuration files upon package updates. It allows for the updating of other files from a package update while, at the same time, guaranteeing no changes will be made to some specific files.
Usage
Setting savedconfig on a per-package basis will restore the configuration files from the /etc/portage/savedconfig/${CATEGORY}/${PN} directory. Make sure the USE flags allow for appropriate dependencies.
External resources
https://packages.gentoo.org/useflags/savedconfig - An online view of packages containing the savedconfig USE flag.