This is a feature of WildFly, you can configure it with the Administration Role Assignment.
If you need such feature, and for other reasons as well, I recommend to use the WildFly 8 from www.wildfly.org
cannot upgrade at this moment. we are in production with 7.1.1.
Any help on how to do this on 7.1.1 is monumentally appreciated
As I said this is a feature of WildFly and there is no way to do this in AS7.
If there is a possiblity to upgrade to EAP with a subscription you can use EAP 6.2+ which is based on AS7 but integrate this feature