I don't think it'd be kosher since manipulating a dimmer still looks like "work" manipulating "fire". They have to do some gay play with randomness:
"The KosherSwitch uses a mechanism where a user moves an isolated piece of plastic, which is not connected to any electrical system, to turn lights on or off. This action does not directly cause the light to turn on or off. Instead, the device relies on a random internal light pulse that determines whether the light will activate after a delay...." yada yada