Don't know that this would be a script idea, but I'd like to have navigation directions through bluetooth. My old LG touch did this and I had to use it because the speaker sucked, but it would still be a nice feature on this phone too. In my truck I could listen to music at a normal level and just wear my jawbone.
In my girlfriends car it has both usb and bluetooth. Every time we mount the sdcard the first thing it plays is the old saved nav direcitons and that makes me really want that to work. I was thinking if it could stream the directions like a phone call, it would stop the music say the directions. Then drop the call and music could play again.
EDIT: Found her radio connects like a set of bluetooth headphones and in mine I can just use the aux in if I use my phone to play music.