I am trying to manage the synchronization options in SharePoint Farm using Powershell.

I would like to change the "Use SharePoint Profile Synchronization" to "Enable External Identity Manager" by code to automate the process of configuration of user permissions and their options. 

http://thesharepointfarm.com/2013/06/using-an-external-identity-manager-for-sharepoint-user-profile-synchronization/

The way it is done manually is: **SharePoint Administration -> Manage Service Applications -> User Profile Service Application -> Configure Synchronization Settings -> Synchronization Options**

Is there any way of accessing and editing this option by use of Powershell? I've already tried to use commands like `Set-SPProfileServiceApplication` and `Set-SPRequestManagementSettings` but I cannot find it. Any help would be greatly appreciated!