I would like to allow a non-"Admin" role to be able to use the Role Administration page. Maybe a "Role Administrator" could be added as a default role? Or even better a more robust scheme that allows the "Admin" role to specify which roles can access admin pages like roles, site settings, content manager, etc... Rather than hardcoding roles to these pages.

In my situation there is a difference between site administration and user administration.  I would like to designate a user as someone who may manage other users excluding admins. I do not want that person to have full admin access to the website and it's underlying files via the File Manager. This is a good way to offload the responsibility of role assignment to a power user so I don't have to do it.  This way managers could control what access their employees have on the website without going through the site admin.