Voice command/custom buttons

[galingula]

After OC I'm back into using my phone for what it's worth and the last thing to conquor is voice command. It says to ppress and hold the talk key and a mike icon will come up, at which point you can vocally demand things from your phone. Problem is, long ago I custom mapped the talk key hold to rotate the screen as the sensor sucked at this.

Now I've forgotton how to custom map a key. Or is there an icon for the mike I can map as a widget?

Little help please, it's the last thing I don't know how to use on my phone