Disable power-off menu when screen is locked I own a Samsung Spica GT-i5700, how can I disable the power-off menu when the phone is locked. I am running CM7.
This feature is in Cerberus Anti Theft and also in some custom android Roms (Such as Exodous). It doesn't require root but like any anti-theft software there is a paid version as the free one is limited to 30 days. 
But you could try the Smart Screen Protector App which is also mentioned in one of the other answers.