Re: abrt usage
It's 2 different applications.
First off.. No, you don't really need a GUI for abrt. It's just to make it a little easier to see the crash dumps and to report the errors.
And yes, the abrt daemon does need to run at runlevel 3 (multi-user.target) so that it catches errors even if you aren't running a graphical desktop.
The daemon is sitting there looking for crashes to occur, and catches the information needed when one does occur and creates the crash dumps.
The GUI is used after the crash occurs for you to go in and look at the crash dumps and to report it if you wish.
Now if you wish to, and don't want to have any of the crash dumps available to you, then you can completely disable abrt. Just set it so that the daemon doesn't run, and then in your gnome-session-properties, set the GUI so it doesn't start with Gnome.