try replacing the uncommented lines by the commented ones.
1:2345:respawn:/sbin/getty 38400 tty1
2:23:respawn:/sbin/getty 38400 tty2
#1:2345:respawn:/bin/login -f user </dev/tty1 >/dev/tty1 2>&1
#2:23:respawn:/bin/login -f user </dev/tty2 >/dev/tty2 2>&1
i had a bit of trouble with that method. have a look at /etc/gdm/gdm.conf
There should be a line containing:AutomaticLoginEnable. you need to set it too true.
theres another option which might be of interest:
(im not sure if it needs to be set to true or to false to login without delay)
i had trouble with disabling autologin. so this is just a hint, im not sure about it (especially as you say its in chroot). I would try editing gdm.conf first (as editing /etc/inittab had no result on a chrooted and repacked live, for what reason ever ??? )