I am halfway myself there.
You need to set some permissions in the nukes core-module mbean configuration.
Go to the nukes/nukes src directory. Under src/nukes-sar/META-INF you will find the jboss-service.xml file. This file contains permissions for menu items and for access to module functionality. To add a menu entry, make sure that you add the componet-operation properly (see examples in file).
To get access to the module functionality I need to find out myself still. At least what you can do, is after adding the menu, login as admin. Admin always has all rights and can see everything.