Persistent Assistant is a Free Cydia Tweak, which listens inside Siri. Simply enable Siri once and Persistent Assistant will continue to listen without touching between searches or request. This tweak could be helpful in certain situations but if you could deactivate without touching it would be much better. So there’s a request to the developer. Let us know in the comments what you think of the tweak.
I love the tweak, it worked for me (iPhone 4 @ 5.0.1. Redsn0w)… but it should be able to recognize when it’s supposed to shut up; i.e. when I ask Siri to ‘open safari’, it keeps waiting for more, and doesn’t open the program.