I saw that app too, but there are plenty of times when I want to lock my tablet, but I don't necessarily want to put it in its case. Also, I work on the tablet in the dark sometimes, so I don't want it to lock while I'm using it.

Also, it only auto locks when you close the keyboard, so if you are working with the keyboard open and then close it, it will lock, but if you are just, say, using canola with the keyboard closed, it will function the same as before.