I've found myself editing countless xml/ini's using UnleashX, all the time wishing it had a copy/paste function on the control pad. It would save people a lot of time eding on the Xbox.
Another great addition would be a simple paste item action/path/list text template system, or better still, add an "Add Folder" option in the contextual menu which auto inserts the list text path into the config.xml and creates the folder on your chosen drive. That one sounds a bit much though. I'd be more than happy with copy/paste.
Easily still the best dash out though. <