Attached is a patch (against Oneiric's lightdm) which adds this feature.

-- 
Kind regards,
Loong Jin


** Patch added: "12_Add_show-guest_config_option_to_SeatDefaults.patch"
   
https://bugs.launchpad.net/bugs/942792/+attachment/2792120/+files/12_Add_show-guest_config_option_to_SeatDefaults.patch

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https://bugs.launchpad.net/bugs/942792

Title:
  lightdm should allow guest session to be disabled at the login page
  while retaining the ability to allow the guest session to be activated
  from another user's session

Status in “lightdm” package in Ubuntu:
  New

Bug description:
  Currently, the only way to disable the guest session in lightdm is to
  set allow-guests=False in /etc/lightdm/lightdm.conf. However, setting
  this causes the Switch to guest user option to vanish from the power
  cog within a logged-in user's session.

  There should be an option to allow an already logged-in user to spawn
  a guest session, rather than completely disabling it.

  Use case:
  John has a laptop he does not want unauthorized users using. On the other 
hand, when a friend asks to use his laptop, he does not want to allow his user 
account to be used.

  In the current situation:
  If John enabled allow-guests=True, in lightdm.conf, then:
   - if the laptop is on, but with the screen locked, an unauthorized user can 
click "Switch User" to return to the lightdm greeter and select the Guest user.
   - if the laptop is off (and does not have a dm-crypt root setup), an 
unauthorized user can log into the Guest account.

  However, if allow-guests is disabled, then John will not be able to
  spawn a guest session for his friends to use when the need arises
  without needing to restart lightdm.

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