You can edit the WP admin navigation however you like (and separately for any WP role) using Admin Menu Editor by Janie Elsts.
There is a free version in the WP plugin repository, but the paid version adds ability to change manu names and move things from top leve to the submenu -- basically design your own WP admin menus however you want.
Free version: http://wordpress.org/plugins/admin-menu-editor/
Pro version: http://adminmenueditor.com/