The ability to have the plug automatically shut off when it loses WiFi signal would be a great addition.
 

A use: I have a device, a heater, that needs to be turned off for safety by temperature sensors and other triggers. If the power goes out, the plug will default to off, but if the WiFi drops, the plug will remain on and not be turned off by any triggers. It would be excellent if I could set it to default to off when it has no signal.  
 

My plug is a KP125M, but it would be a good feature for any.