Take a look at Fibaro on Vesternet.com. They are ZWave devices that allow for switch override
Dual Relay - http://www.vesternet.com/z-wave-fiba...insert-2-1-5kw
Dimmer - http://www.vesternet.com/z-wave-fibaro-universal-dimmer
LightwaveRF is 1-way / ZWave is 2-way (i.e status feedback)
Vangelis