A new cydia tweak called LockSliderz allows you to add dual functionality to your lock slider, along with a 2nd one, providing up to 4 different functions. As always, you can slide the knob to unlock your iPad and return to the last application you were working in before you put your iPad to sleep. Now there are options to adjust the size of the sliders, and also select a specific iPad app to launch directly from the lock screen. LockSliderz on my iPad and iPhone has been quite functional and useful overall, especially if you have a few apps that you generally launch on your iPad.
LockSliderz is available for $1.49 from the ModMyi repo in Cydia. This tweak has options controlled in your Settings app, and does not add a new icon to your iPad springboard. This is one of the more useful paid Cydia tweaks for your iPad.