I don't know if this is possible, but I would like that a certain usergroup (e.g. editors) can only see a certain usergroup in the tab users (manage --> users) when logged in. In this way they can control certain users (e.g. certain members) but cannot mess with other accounts (e.g. admins).
If there's another way to do this (for ex. with a Migx) then feel free to share.
I'm afraid the Revolution security system won't do that at this point (2.4.2). Either users have access_permissions permission (which allows them access to the permissions of all users) or they don't.