Samsung SCH-A670

I just got the A670 and love it so far. I am particularly impressed with the name/voice recognition. I never had a phone with it and it has been very accurate, I love the fact that it does not need to be "trained." Anyway, I use the phone alot and recently purchased the full install HF kit. One small question. Is there anyway to add a "remote" button that can perform a send/end command as well as activating the voice prompt? I believe that Samsung makes an OEM ear piece with the send/end button, but can a remote be added to the HF kit. Also, the HF control box does not have an input for an external antenna; however, in the back of the phone there appears to be a port for it. Anyone know what type of plug or adapter is needed to connect an external antenna?