Well, you can set your Thrive to not have a lock screen natively. There's no need for another app.
And no, it doesn't help with the sleep issue. I've had my lockscreen deactivated since day one and still had the issue. It's an issue with the sleep state that causes it. Advanced WiFi Lock (which allows the screen to turn off, but actually prevents the tablet from going to sleep) was the only thing that prevented the SOD for me.
But rushless is right. There's an update coming that will fix it soon.