How can I let a "subadmin" to assign only particular roles to other users?
Just an example: my users can only use the forum if they have the "forum user" role. I would like to delegate the right to a "subadmin" to assign the "forum user" role to particular users, without letting this subadmin to be able to assign any other roles. Or I also want to let this subadmin assign the "article creator" role to others, etc.
Is there a module for that? Or do I have to create my own?