Re: thinking about people with limited mobility
It is good to be thinking about folks who can't or won't use the existing wall switches for lighting and sockets. In the UK (and presumably elsewhere) there are already products available to address that market. Some of the products have been around for years, and don't even need a cloud connection. Buy it - fit it - own it :) Remember, the S in IoT is for security.
See e.g. http://www.screwfix.com/c/electrical-lighting/smart-switches-sockets/cat9340001
(some cloudy products, others just with what you might call a 'local remote' capability). Other retailers may be avalable.
Remote control socket adapters (plug it in the wall socket and you instantly have a remotely controllable power socket) and such now even make regular appearances as Aldi special buys.
"with a bit of imagination, this stuff can be fun."
Fun's good. IoT marketing hype less so.