CentOS - Apr 2016 - CentOS 6 kickstart missing 'shell command prompt' screen at ALT+F2

Hi,
?I've recently setup a centos 6 kickstart environment. Interesting fact is
that the helpful 'shell command prompt' screen is missing when I press
ALT+F2 key combination even on locally connected keyboard and monitor. ( my
kickstart runs in text mode).

All other screens can be found without issues with ALT+Fn key combination. 

I googled internet, and found someone reported similar issues, say, here is one
link:
http://serverfault.com/questions/322374/kickstart-virtual-console-no-shell-prompt-at-alt-f2.
I read the link several times and still dont quite see why this happens, got
confused at the following places:
1, when -- at which installation stage -- the 'shell command' screen
will show up?2, if centos 6.6 and 6.7 comes without 'shell command
prompt' screen with default installation media, then which installation
media contains the file(s) that we can tune? /etc/inittab doesn't contain
the entries related to tty consoles.
Centos 7.x doesn't have the issues and it looks like centos 7 leverages a
new method to get shell command prompt.
Many thanks in advance.
Best,David