In the 2.10 "Post-installation" section of the handbook it would be helpful to have a subsection for each entry on this page that describes exactly what configuration files are affected by the changes made in sysinstall that are recommended here. This way, the person installing the system can see exactly what is happening, and can make changes later without referring back to sysinstall. For example, one would think that everything is in rc.conf (which most of it is), but when you set the timezone with tzsetup, you are creating an /etc/localtime file from the possibilities in /usr/share/zoneinfo, and this is not obvious.
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I'm gonna close this one as not accepted. If someone want to make the "same" configurations done in the install process they can use 'bsdconfig' tool.