When a collection has completed, and my default command is run (bat file) altbinz spawns a new cmd process to run the script. When downloading many small collections at once this is very annoying. This new window takes focus, and also distracts you during movie/television viewing. If you were a gamer, this would be even worse, as it would probably kick you out of your game.
I have seen in some applications (drag+drop robot ... donationcoder.com) there is a way to redirect execution of the .bat INSIDE of a child window, without creating a secondary window. This would be much preferred in most cases (unattended scripts), though no matter how good a feature may be, there may be people who have taken advantage of the way things are now, so this should be added as a checkbox 'redirect to own tab' on the NZB2 option page.
This will also bring the side benefit of being better able to log and monitor the actions of the scripts ... useful for debugging. As it is now, I do very little debugging echos because I would never see them in time (unless I added very annoying pause statements all over)