Please give us RBAC

Please can you create an RBAC style user control. It would be useful to modularize the controls and or parts of the system, for example:

Role A → Only allowed to See Devices
Role B → Allowed to See and edit devices

We should have the ability to customize these roles to how we see fit, instead of adding a user, and adding a single device to a single user. Its very time consuming if we have multiple devices to assign to a single user.