So far as I know, there is no proper roles and permissions plugin for Elgg. Such a plugin would be extremely useful but would take quite a bit of time to develop. So someone would have to take that on or fund a developer to do it.
There's a quite old plugin which implements roles, karma points. Another one, karma rights, implements access rights.
I remember at least one more plugin which implements roles.
@Carina I think the plugin Premium Members by Webgalli does that, which let's only a user type to use certain plugins.
Rodolfo Hernandez
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