Feature request: Allow setting PREFerrenced telephone number/email address/messenger for contact.

I have some contacts which have multiple telephone numbers, email addresses or messenger services they use. For each of these 3 categories, I want to mark the preferred one. I know that vCard supports such a preference [1].

However, I cannot find a button in the edit window inside kontact/kaddressbook to mark e.g. the preferred phone number.

Therefore I'm making this feature request.

[1]: vcard rfc

P.S.: I was sent here from the forum