Role management for Wordpress Multisite sites.

My not-for-profit site - - uses WordPress Multisite and I want to allow regsitered users to create sites. Some of the sites will be "owned" by individuals but others will be owned by organisations - incorporated and not.

As straight WordPress has six predefined roles as described at, is there any equivalent available with Multisite that the Super Admin user can also set up or over-ride on a site-by-site basis where necessary?