This app seems to have been around for a while but it completely passed me by until Saurik decided to advertise it on the Cydia front page as part of the refresh for the new jailbreak this week!
Have you ever wanted to open and App and have your iPad stay in there no matter who pushes the home button? Maybe you want to give a younger member of the family a game to play or book to read, but don't want them poking around elsewhere? Well enter IncarcerApp, a free Cydia app.
IncarcerApp disables the home button whenever you like, effectively locking you into the app your currently in. The activation can be done by any gesture or button combination recognised by "Activator" another core jailbreak component (which will be installed with this app if you do not already have it).
By default, a quick press down and then up on the volume keys enables and disables IncarcerApp. The app itself is based on the backgrounder source, so it bears a striking resemblance to that app...
You can of course choose apps to exclude from being "incarcerated" by listing them in the "Overrides" section.
There's not much else to see. When the tweak is activated or deactivated you get a popup on screen as you can see below, but other than that, you are good to go!
Activate it and your home button is disabled, so whoever is using your iPad is stuck in whichever app you have open when you give it to them, and hopefully only you know the trick to unlock it again!
Have fun incarcerating your apps people!