9.0-RC1 - installer observations and "shell in new system" gamble...

.
During install, in the 'Add Users' part, why is it able to add the new
user 'peter' to a new group 'peter' [the default option], but when I try
to put user 'peter' into a more generic new group 'admin' it says group
does not exist - I figure group 'peter' also does not exist at this time.

"Invite peter into other groups? []" - Sounds like the user gets an
invitation and that I should answer 'yes'/'no' here, not with an actual
group name, how about "List other groups peter should be added to:"

Also, after I'm done with that and "Open a shell in the new system",
/etc/passwd is populated with user 'peter', but /etc/rc.conf and
/etc/fstab files do not exist.  I wanted to change fstab to use the gpt
labels, not partition numbers but that file does not exist and gets
overwritten by installer on reboot.

rc.conf - I created a one line comment "#pk test' - after reboot this is
what I have in /etc/rc.conf
$ cat /etc/rc.conf
hostname="pkbsd"
# pk test
ifconfig_em0="DHCP"
sshd_enable="YES"

So my comment stayed but was moved when installer configs were written on
reboot.

Added same comment to /etc/fstab, but it did not stay and was overwritten:
$ cat /etc/fstab
# Device        Mountpoint      FStype  Options Dump    Pass#
/dev/ada0p2     /               ufs     rw      1       1
/dev/ada0p3     none            swap    sw      0       0

So even if I did add the gpt labeled 'Devices' in there, it would be
overwritten when the installer reboots and makes the live shell a gamble
of what will stay what won't on reboot....

]Peter[