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Hello,
To change the names of modules go to your admin panel then modules administration then underneath the module logo there is a text box which you can change the default name of the module to anything you like, this will reflect in the module page title as well.
On the module admin page you can also change the weigt of which modules appear in the main menu by changing the values in the order column.
Im not sure what you are meaning in your second question "pre configured menu items", you can change the look of the main menu in your themes style.css file, if a theme has some hard coded menu then it will be inside either theme.html or another file within your theme directory.
Hope this helps you out