This is not possible in JBoss AS7 - all users with access to the management interface have all privileges.
In Wildfly 8 which is the successor to AS7, there is new role-based access control to administration interfaces including the web console.
Have a look at these guides:
http://planet.jboss.org/post/role_based_access_control_in_wildfly_8_tech_tip_120
http://wildfly.org/news/2013/11/07/Role-Based-Access-Control-in-WildFly-8/
If you are getting started with Jboss at this point in time, I would recommend upgrading to Wildfly 8 as there are a lot of changes under the hood. JBoss AS7 is basically a 'dead' release, there are no new official releases of the AS7 branch coming.