General :: Custom Bluetooth Headset Button Actions?

Is there any application or way to customize the actions performed when the headset button is pressed?

I use Tasker for various automated things, but looks like there's nothing there (did I miss something?).

Specifically, this is the button on a bluetooth headset that would normally start the voice dialer -- I'd like it to do something different, perhaps. I know that the button's "command" can be intercepted by some applications, because I know that Vlingo, when installed, becomes an option of an application that would "handle" the bluetooth button press (i.e. when I press it, it pops up a window for "which application do you want to use for this").

Unfortunately, Vlingo just uses this to launch its own voice dialer... If it matters, I'm using the Galaxy Nexus on ICS.