Thanks Thomas for your feedback!

- One thing that bothers me is that I can't see which addressbook user is in, please add a comment or category for this.

It bothers me too! I'll implement this in next release.

- Double click currently has no action, please do "open"

I'll add a preference in the next release so the user may decide what happens, maybe send an e-mail, chat, call or open the contact card.