QuickReply for SMS is another great add on available on cydia, With this app you can reply to SMS directly from any app, You dont need to close the current app that you are using to reply the SMS anymore.
Once you receive SMS, You will see the Message box with 3 buttons including Close, View and Reply, If you choose View it will close the current app and launch the default Messages app, If you choose Reply then it pops Keyboard and text box just like what your default Messages app shows when you reply, only difference is that will be in transparent form. Once you hit the Send button, It will close.
This app works great, Though you wont see any icon or toggle for this app, Once installed just reboot it.
QuickReply for SMS is available on CydiaStore for $2.99. Even the cracked version is available under xsellize repo !!!
The iPhone Help
The iPhone Help