Bluetooth Opimization on 2008 pkg 5, JBL, Nav

First please forgive me if this question has been addressed. I've searched for an answer but either I can't frame the question right or, well, it hasn't been.

I recently got an '08 package 5 with JBL sound and the nav system. From what I've seen so far, the Bluetooth integration is somewhat lacking. The car wants to use its own voice-activation system, but my Verizon Droid Razr phone has a much more sophisticated system built in.

What I'm missing is something that Bluetooth headsets call the multi-function button. You tap it twice to redial, hold it to initiate a voice command, etc. I'm pretty sure the Prius Bluetooth doesn't have an equivalent. Can anyone point me at a hack or workaround?

Thanks for any tips,

Andy