I have one from the Verizon store that's perfectly fine, uses velcro. I work with sensitive systems that have lots of storage on magnetic media, so I disliked the idea of having a case with a magnetic chunk in it. Guess I was lucky to have avoided it.

It looks pretty simple to fix though. Just add an option to disable the keyboard slide from triggering a wake-up. In fact, while you're at it, add options to turn on/off the lock switch, power supplied, and front slider as well, since some people prefer to disable such things. (Just make sure they can't disable ALL of them at once. )