Get the extraction dialog to automatically close after it's finished instead of saying: END OF COMMAND and then having to manually close the dialog.
IMO this could be good, but if it's implemented there should be a Preferences checkbox to toggle between the present behavior and this one.
Sorry, I think this is not a good idea. Usually, you want to know when your archiving task is finished and if it was successful...
Perhaps a good compromise would be a notification box that pop up(non-intrusive) and goes away after a few seconds. If error, it stays until clicked. Sort of like growl.