VoiceActivator looks very promising. It gives you custom voice control commands. VoiceActivator is a new tweak by chpwn (http://chpwn.com/) to let you take full control of the Voice Control feature of your iPhone or iPod touch. Launch apps, open URLs, use Activator actions: it’s all here, in one tweak.
VoiceActivator is coming soon to the Cydia Store! Follow @chpwn on Twitter for news and updates. http://chpwn.com/