Put down the iPad without closing the app, and work up this morning to a dead iPad. The app cancels autolock, even when a video is not running. So, be advised... On the flip side, it DOES mean that you can select your shows for prep and downloading at night, and wake up to find them nicely ready to go on the iPad in the AM -- provided you leave it plugged in to the charger.
I think the ideal solution is like the new iOS WiFi Sync, auto-download in the background when on a charger and on WiFi only. Manual is all other cases. That will solve this issue--that and now forcing the lockout obviously.