How can I add a custom item to the nautilus context menu, but NOT in a sub-menu?

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http://askubuntu.com – I am interested in adding a custom script to the Nautilus context menu. I am aware of solutions such as the Scripts folder and the Nautilus Actions application. I created a test action in Nautilus Actions, but it only appears under the "Nautilus-Actions actions" submenu. I would like to be able to add an item to the root level of the context menu itself (at the same level as cut, copy, dropbox, compress...) and not in a submenu. Is this possible with Nautilus Actions? If it isn't, is there any other way? (If it involves coding or strange configuration changes, that's OK too) (HowTos)