The option to select which calls to dial from the PC, by copy/pasting the number to the phone dialer, would make the android and airdroid phone seem like a fully integrated work tool. The phone could then be used as speakerphone.
As well being able to click on the answer button form the PC, to answer the calls in the phone, would be a nice option. The answer is not as handy as the dialing option, since the phone already comes alive when a call is received, therefore answering is easy.