Role seperator and subroles

I would like to have a role separator (it cannot be displayed to users, but there will be such a white stripe in the list of roles) as well as subroles (a role that has subroles can be transparent and without a frame, with a colon at the end, and below it with indented right side of the subrole. Also if, for example, a role that has subroles has only the rights to "watch the audit log", and the first subrole will have the right to "manage roles", and the second to manage the channels, then the user with the role and two subroles will have all three of these rights.