The back cover is pretty good - it feels good and safe holding N900 in hand now.

The only drawback is memory card and not appearing flashlight panel. But knowing Mugen Power Batteries I guess they could send us all new battery covers. At least I hope.

Why not try to solve it the other way? It has to be just some config file or dbus message... We just have to find out how Flashlight checks for opened/closed camera lens cover and then you may look for a way how to make some permanent changes.