I just installed Flyscreen and it seems that it disables requiring the Lock Pattern - so anyone can get into your phone!
If I set "Require Lock Pattern" on in Droid Settings then leave the phone so screen goes dark. When I turn on phone, Flyscreen is displayed, but as soon as I touch menu it takes me to the Home page (No lock pattern). When I look at Settings again then "Require Lock Pattern" has been set to off.
I have tried this several times and even rebooted phone. If I can not get this resolved, then will probably uninstall - as risk too high.