I have noticed that I cannot tag a contact to notify me when their presence changes from my contacts list using the calls feature. It can only seem to be done via chat. Is this by design or am I not doing something?
Nah, your not going insane. Contacts and groups are a bit confusing at the moment - you can have chat groups, contact groups in chat which are separate, and call contacts which are separate from chat contacts. Basically, it would be fantastic if they can unify them!