Allow Role Assignment to Nested Dashboards

I would like the option to assign view/manage role access to dashboards that exist within a dashboard group. 

We use wall mounted displays that cycle dashboards in a group for various clients using the slideshow feature. These displays are used by our support team so that they can keep an eye on clients at a high-level. We also want to provide a key contact at some of these client companies with view access to their respective dashboards.

I see two ways to accomplish this currently: 

1. 1. We can clone the dashboard within the client dashboard group, then assign our client contact view access to the cloned dashboard. This allows us to keep the functionality of the dashboard group for our support team, but requires several duplicate dashboards.
2. 2. We can skip the dashboard group and assign access for our support team and client contacts on a per-dashboard basis. This omits duplicate dashboards, but requires additional management of role permissions when creating new dashboards.

Adding the ability to assign role permissions to nested dashboards would allow for simple access management for the support team, providing access to all dashboards within the "Clients" group, while also allowing one-off access to individual dashboards for client contacts without having to manage multiple dashboards per client. A simple toggle arrow (as is used in the Devices tree) could be implemented as a UI element to add this basic access management.