There is a Powershell, but can this be displayed as a GUI?
Get-MailboxFolderPermission John:\contacts | Select FolderName, user, AccessRights
Then be able to set permissions to contact as editior, publisher etc.
Add-MailboxFolderPermission John:\contacts -AccessRight PublishingEditor -User Suzan
We can currently view calendar permissions but to be able to edit contact, task etc would be wondreful.