Whitelist for address books

[allo-]

Currently there is a whitelist feature on per-contact basis. But android has support for different address books (even from different sources), which would be a good point to group contacts together, which should be whitelisted.
I.e. you could have some "whatsapp" addressbook, which may be read by whatsapp, while all other address books are disallowed.
Then you can add new whatsapp-contacts to this addressbook and keep i.e. contacts for your e-mail app in another address book.