[otrs] Restriction to SwitchToUser

hello, this is my doubt: I wish there was a manager to OTRS with permission to manage users, including use SwitchToUser. For this I created a group called G_MANAGE and I added it in Frontend :: Module # # # AdminUser in Framework-> Frontend :: Admin :: ModuleRegistration. The SwitchToUser is enabled. Alright here! The problem is that I would want that a G_MANAGER group user can't "become" a member of the admin group using SwitchToUser. What do I do to add this restriction? Thanks, Jocielma Monteiro