[Koha] Intranet Security

I have been thinking about the current intranet security setup whereby any staff member can access any part of the intranet. Is this the policy in the libraries that are currently using Koha? It may be important to some of the larger systems (where more than a dozen people are using the intranet) to increase the levels of password protection. My concern is less of a control issues and more of an "oops I just deleted our main branch" issue. Even adding one more layer by seperating the admin from the normal staff functions might be useful. Even better, maybe users could be added and given "permission" to access parts of the intranet. What does everyone think? Joshua