In contacts, be able to see when you last contacted that person. And be able to quick edit contacts in the list view without having to open the whole card. Rename the sections that underline contacts.
I often see email addresses with typos, etc. that I would like to delete from a contact. Also would like to be able to associate contacts / merge contacts and delete contacts.
Not intuitive UI for editing / deleting contacts.
I also want to be able to add a contact within the mobile app - I meet most new contacts when I'm NOT at my computer.