How to disable guest session ONLY from login screen?

view full story

http://askubuntu.com – I DO WANT: To be able to select a guest session from the user menu when logged in to my administrator account in case someone needs to use my computer. I DO NOT WANT Someone to be able to turn on my computer and login to a guest session I have heard of a method where one edits /etc/lightdm/lightdm.conf to include allow-guest=false (then restarting lightdm) The problem with that method is that I specifically do not want to completely disable the guest account. I only want to disable access to it from the login menu while still retaining the ability to (while logged in to my admin account) (HowTos)