I'm really interested in something like this too.
I'm just about to start development with python and I will try to do something.
In theory, you can do all this with a shell script ..
If anyone wants to collaborate with me you can send me a message.

I would even add, if the network is encrypted with wpa/wpa2/wep try dictionary attack, if doesn't work and is wep try collecting IV's to guess the key.

:P