[Exeric]

There is a way (I think) to eliminate any leakage current from lighting up high sensitivity LEDs. You can get a double pole wall switch. They aren't very common but they can be found on the internet, and not super expensive either. Don't confuse them with 3 and 4 way switches. Just hook up the hot wires to one pole and the ground wires to the other pole. That should do it. If you are using multiple wall switches for controling one light it wouldn't work very well, though.

Really, the only reason I could ever see for worrying about leakage current turning LEDs on is if the lights are in your bedroom and you want it totally dark at night. The other reason would be is if the house is miswired, but you'd likely have the LEDs burning pretty brightly then.

Edit:
Actually, if one was determined to eliminate the problem with a double pole switch then it would be better to connect the 2 poles to the hot and neutral wires, (black or red, and white respectively.) That way you would still having a working ground protecting you while still eliminating any possible closed circuit between hot/neutral to ground turning the LED on.