Could you use the N900 as a bluetooth keyboard?

I know people are talking about using a bluetooth keyboard to the N900 for better typing. However I was wondering if I could use the N900 to type on my laptop if I am across the room from it. Say the laptop is my media center and hooked up to my TV.

Could you send your phone call through the radio transmitter?

Say you get a call in your car and you dont have your headset or you dont want to hold the phone up to your ear and the speaker phone isnt working for you. Maybe there is a way to transmit your call over the radio to hear them better?

Just a couple ideas I had. What does anyone else think?