New lock mode

[Prejlin]

Does anyone know of a tweak that locks an iphone 4(ios 4.3.3) when the proximity sensor is covered, similar to the call feature but i want to know if there is any that locks the phone because i have a cover that flips over the screen and sometimes i forger to lock

[GnatGoSplat]

I'm not aware of one, but wouldn't it be annoying if everytime you put the phone near your face, it locks?