Hi ...
Thanks for this tip...
but there are 2 things, i want to say:

1. There is a switch you can add. So the new session will close automatic on quit of PlaneShift: -terminate ... looks loke this in your code:
X :3 -ac -terminate & nvidia-settings --load-config-onlyor without the nVidia specific setting:
X :3 -ac -terminate &

2. The work-around, not to process all these things as "sudo" you can edit the file "/etc/X11/Xwrapper.config" as root under Ubuntu like this:
sudo gedit /etc/X11/Xwrapper.configand replace the word "console" with "anybody" how the next code shows it:
From:allowed_users=consoleto:allowed_users=anybody

..and theres one question i have: to switch to console 7, on witch is gnome present i press [ctrl]+[alt]+[f7] ... but how can i switch back do the session 3, where ps is running?